Complex sentence: After tricking Swann into leaving his fingerprints on the letter, Tony offers to pay him £1,000 to kill Margot; if Swann refuses, Tony will turn him in to the police as Margot's blackmailer.
Split into simpler sentences: After tricking Swann into leaving his fingerprints on the letter, Tony offers to pay him £1,000 to kill Margot. If Swann refuses, Tony will turn him in to the police as Margot's blackmailer.