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                <h3>The full text:</h3>
<p class="full">
<h3>The truncated text:</h3>
<p class="preview">

<p>Sentences to include: <input id="showAmount" value="2" onkeyup="updateTrunc()">




                String.prototype.truncateBySent = function(sentCount = 3, moreText = "") {
  //match ".","!","?" - english ending sentence punctuation
  var sentences = this.match(/[^\.!\?]+[\.!\?]+/g);
  if (sentences) {
    if (sentences.length >= sentCount && sentences.length > sentCount) {
      //has enough sentences
      return sentences.slice(0, sentCount).join(" ") + moreText;
  //return full text if nothing else
  return this;

//testing stuff
var someText =
  "Sample sentence one? Another sentence two. Another three. Is there four? What about five? And six! Finally seven. Eight";

document.querySelector(".full").innerHTML = someText;

//how to use it:
document.querySelector(".preview").innerHTML = someText.truncateBySent(
  ' <a href="#">View More</a>'

//for testing / preview
var updateTrunc = function() {

  document.querySelector(".preview").innerHTML = someText.truncateBySent(
    document.getElementById("showAmount").value,' <a href="#">View More</a>'