Complex sentence: Unfinished Business (Running Press 2007)-a true crime Mafia book co-authored with former FBI agent Joe Pistone, who went undercover as "Donnie Brasco" (portrayed by Johnny Depp in the feature film).
Split into simpler sentences: Unfinished Business (Running Press 2007)-a true crime mafia book co-authored with former FBI agent Joe Pistone. Who went undercover as "Donnie Brasco" (portrayed by Johnny Depp in the feature film).