Presumably (unless you're manager expects something else which I doubt) the best file format is .txt
You can load the file into any word processor such as MS Word or Notepad++ with TextFX plugins and enable all characters to be visible to see what you want to keep or not. To seperate single lines from multiple lines (not sure why you'd want to but let's say you do) you can use regex in Notepad++. Most things you want to do with text can be done with Notepad++ and Google queries.