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HTML 

              
                left__bottomleft__bottomleft__bottom

<div>This is a content staying above the ScrollTriggers content. </div>
<div class="container">
  
  <div class="left">
    <div class="left__pinned">
      This is what stays on top when user reaches the container
    </div>
    <div class="left__bottom">
      This is what stays on bottom
    </div>    
  </div>
  
  <div class="right">
    <div class="item">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Rerum provident fuga a harum quia deserunt, tempore doloribus reiciendis dolores aperiam, nisi non quae expedita. Alias voluptatum provident porro corporis consectetur!
      Amet officia saepe consectetur dolorem officiis, ipsam repellat ad quis ab perferendis non quia ratione numquam obcaecati! Obcaecati laudantium eveniet laboriosam illum praesentium perferendis consectetur dolorem rem! Eligendi, amet magni.</div>
    <div class="item">Rerum provident fuga a harum quia deserunt, tempore doloribus reiciendis dolores aperiam, nisi non quae expedita. Alias voluptatum provident porro corporis consectetur!
      Amet officia saepe consectetur dolorem officiis, ipsam repellat ad quis ab perferendis non quia ratione numquam obcaecati! Obcaecati laudantium eveniet laboriosam illum praesentium perferendis consectetur dolorem rem! Eligendi, amet magni.</div>
    <div class="item">Alias voluptatum provident porro corporis consectetur!
      Amet officia saepe consectetur dolorem officiis, ipsam repellat ad quis ab perferendis non quia ratione numquam obcaecati! Obcaecati laudantium eveniet laboriosam illum praesentium perferendis consectetur dolorem rem! Eligendi, amet magni.</div>
    <div class="item">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Rerum provident fuga a harum quia deserunt, tempore doloribus reiciendis dolores aperiam, nisi non quae expedita. Alias voluptatum provident porro corporis consectetur!
      Amet officia saepe consectetur dolorem officiis, ipsam repellat ad quis ab perferendis non quia ratione numquam obcaecati! Obcaecati laudantium eveniet laboriosam illum praesentium perferendis consectetur dolorem rem! Eligendi, amet magni.</div>
    <div class="item">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Rerum provident fuga a harum quia deserunt, tempore doloribus reiciendis dolores aperiam, nisi non quae expedita. Alias voluptatum provident porro corporis consectetur!
      Amet officia saepe consectetur dolorem officiis, ipsam repellat ad quis ab perferendis non quia ratione numquam obcaecati! Obcaecati laudantium eveniet laboriosam illum praesentium perferendis consectetur dolorem rem! Eligendi, amet magni.</div>
    <div class="item">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Rerum provident fuga a harum quia deserunt, tempore doloribus reiciendis dolores aperiam, nisi non quae expedita. Alias voluptatum provident porro corporis consectetur!
      Amet officia saepe consectetur dolorem officiis, ipsam repellat ad quis ab perferendis non quia ratione numquam obcaecati! Obcaecati laudantium eveniet laboriosam illum praesentium perferendis consectetur dolorem rem! Eligendi, amet magni.</div>
    <div class="item">Rerum provident fuga a harum quia deserunt, tempore doloribus reiciendis dolores aperiam, nisi non quae expedita. Alias voluptatum provident porro corporis consectetur!
      Amet officia saepe consectetur dolorem officiis, ipsam repellat ad quis ab perferendis non quia ratione numquam obcaecati! Obcaecati laudantium eveniet laboriosam illum praesentium perferendis consectetur dolorem rem! Eligendi, amet magni.</div>
    <div class="item">Alias voluptatum provident porro corporis consectetur!
      Amet officia saepe consectetur dolorem officiis, ipsam repellat ad quis ab perferendis non quia ratione numquam obcaecati! Obcaecati laudantium eveniet laboriosam illum praesentium perferendis consectetur dolorem rem! Eligendi, amet magni.</div>
    <div class="item">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Rerum provident fuga a harum quia deserunt, tempore doloribus reiciendis dolores aperiam, nisi non quae expedita. Alias voluptatum provident porro corporis consectetur!
      Amet officia saepe consectetur dolorem officiis, ipsam repellat ad quis ab perferendis non quia ratione numquam obcaecati! Obcaecati laudantium eveniet laboriosam illum praesentium perferendis consectetur dolorem rem! Eligendi, amet magni.</div>
  </div>
</div>

<div>This is a content staying below the ScrollTriggers content. </div>
<section style="height:500vh">
  <h1>Extra space just for demo, remove this</h1>
</section>
!

CSS 

              
                
.container {
  display: flex;
  align-items: stretch;
}
.item {
  padding-bottom: 5em;  
  background-color: white;
}
.left {
  width: 30%;
  border: 1px solid red;
  background: yellow;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.right {
  width: 60%;
  margin-left: 10%;
}
.left {
  height: 100%;
}
.left__bottom {
  background: green;
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger);
ScrollTrigger.create({
  id:`pin`,
  trigger: ".left",
  pin: ".left__pinned",
  start: "top top",
  endTrigger: ".container",
  end: "bottom top",
  pin: true,
  pinSpacing: false,
  //markers:true
});
gsap.utils.toArray(".item").forEach((panel, i) => {
  ScrollTrigger.create({
      id: 'item${i}',
    trigger: panel,
    start: "top top",
    //markers: true,
    pin: true,
    pinSpacing: false
  });
});
!
999px

Console