Complex sentence: His most memorable characters at SNL included belligerent Samurai Futaba, and an imitation of British singer Joe Cocker that was so accurate Cocker himself briefly believed Belushi was lip synching to a Cocker vocal track rather than singing live.
Split into simpler sentences: His most memorable characters at SNL included belligerent Samurai Futaba, and the imitation of Cocker. The number was so accurate Cocker himself briefly believed Belushi was lip synching to a Cocker vocal track rather than singing live.