There is no Automatic way. You could try AutoFormat on a copy of your converted document. First set your AutoFormat options under AutoCorrect Options on the Proofing options. Then Alt+Ctrl+K in the document starts AutoFormat.

Generally I do not work with converted documents. I import the text into a clean Word document as plain text and reformat it using Styles. The conversion processes used by any software I've used, including those by Word, give very messy documents when you try to edit them. In addition, I suspect that some of those Indents are margin changes (section breaks).