Edit in JSFiddle

$(document).ready(function() {
  $("button#remove-link").click(function() {
    $("#content a").remove();
  });
  $("button#clean-content-div").click(function() {
    $("#content").empty();
  });
});

<h2>jCombat Demo - jQuery DOM Manipulations</h2>

<div id="content">
  <p>This is a paragraph. <a href="#">Sample Link</a></p>
</div>

<button id="remove-link">Remove link</button>
<button id="clean-content-div">Clean content div</button>