Here is the simple way. Note that I would agree that you must learn some code to be able to fix various issues.
Look at your xhtml, you should see something like:
<p>One paragraph.</p>
<p>Another paragraph</p>
Change this to
<p>One paragraph.
<br />Another paragraph</p>
This is less complicated than fiddling with the CSS. If you need to do a number of these, then use Find/Replace.