Complex sentence: Tapp then proceeds to save his sixth victim, Jeff Thomas, who was in the "Drill Trap" when Tapp and Sing had raided Jigsaw's lair during "Saw".
Split into simpler sentences: Tapp then proceeds to save his sixth victim, Jeff Thomas. Jeff was the man who was in the drill trap when Tapp and Sing had raided Jigsaw's lair during "Saw".