[JSWolf]

My solution... don't use Word at all. Use a good text editor like Notepad++. Use text markup to denote styles and other formatting you want. Then import into Sigil and work from there. You'll have very clean code that does what you want.

But since you are into editing the ePub, what I do with a Word sourced ePub that's full of crud is to start off by getting rid of the crap in the CSS and then to clean up the styles so you don't need different styles to do the same thing. Also, go through the text and get rid of any unneeded spans and other garbage from Word. Save often and keep backups. Make the code as clean as you possibly can as that will help you should you need/want to edit anything. Going through all those msonormal type styles is a pain. And then there is the rather long list of fonts and colors and other junk that you can get. keep at it and get rid of anything that's not needed and you will win the battle.