Complex sentence: Dexter and Furie decided to take the maverick action of finishing the film with a stand-in (James Payne) for Sinatra's remaining scenes, editing in close-ups from earlier shots in postproduction and overdubbing the dialogue.
Split into simpler sentences: Dexter and Furie decided to take the maverick action of finishing the film with a stand-in James Payne. For Sinatra's remaining scenes, editing in close-ups from earlier shots in postproduction and over-dubbing the dialogue.