Just open up the html file in a text editor and do a find/replace job.
Eg:
Code:
<div style="margin-top: 1em; text-indent: 1em"><font size="3">Blah blah blah, paragraph 1.</font></div><div style="margin-top: 1em"/>
Find
Code:
<div style="margin-top: 1em; text-indent: 1em">
Replace all
Code:
<div style="text-indent: 1em">
And (maybe) do the same with
Code:
<div style="margin-top: 1em"/>