You could place the {INSERTANS} in a span and then use JavaScript to grab the contents of the span, get rid of the commas and ampersand and insert line breaks.
1) Place the {INSERTANS} tag in a span with a unique class. So the source would look something like:
<span class="prevAnswers">{INSERTANS:11111X22X33}</span>
2)
Set up your survey to use JavaScript and place the following script in the source of the question:
<script type="text/javascript" charset="utf-8">
$(document).ready(function() {
var prevAnswers = $('.prevAnswers').text();
prevAnswers = prevAnswers.replace(/ & /, '<br />');
prevAnswers = prevAnswers.replace(/, /, '<br />');
$('.prevAnswers').html(prevAnswers);
});
</script>
