Hi goldfish,
Don't you still have the original document, then? I ask because PDF-to-Word conversion often doesn't produce an editable 100% faithful replication of the original.
If you don't still have the original document, you might get better results doing a straight PDF-to-Kindle conversion, using tools such as those available here:
http://www.pdftokindle.com/ (currently available as a free download, but normally only US$39.95).