A family of Microsoft word processing software products for creating web, email, and print documents.
When I want to do this for a document I plan on using and editing is I select the contents is the pdf, create a new document, and paste, as text only. Then I do formatting in Word using styles.
No conversion process between these file formats is perfect. There is no 1:1 correspondence of features and how the programs handle formatting. Any converted document will be difficult to edit. How difficult will depend on how complex the formatting is.