JSFiddle - React, Tailwind, and code Playground

HTML

<div class="span8 inner-left" style="clear:both;">
 <div class="span3" style="text-align:right;">B</div>
    A
    <div class="span33" style="text-align:right;">B</div>
</div>
<div id="moreread" class="span4 inner-left">C</div>
<input type="button" id="b" value="Move" />

JavaScript

$('#b').click(function() {
    $('#moreread').insertAfter('.span3');
});