<div class="wrap">
  <span class="chapter">Раздел 1</span>
  <span class="title">Описание 1</span>
</div>
<div class="wrap">
  <span class="chapter">Раздел 988734</span>
  <span class="title">Описание 988734</span>
</div>

body {
  background: #444;
}
.wrap {
  margin: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  color: #ffd486;
}
.wrap .chapter {
  display: flex;
  flex-grow: 1;
}
.wrap .chapter:after {
  content: '';
  display: block;
  border-bottom: 1px dotted #fff;
  flex-grow: 1;
  margin: 0 10px;
}
.wrap .title {
  flex-shrink: 0;
  width: 20%;
}