Complex sentence: Kip arrives to save him, and Memphis enters the warehouse to settle the score with Calitri, but Calitri faces Casltbeck intending to kill him, before Calitri can shoot Castlebeck, Memphis pushes him off a balcony ledge sending Calitri falling to his death.
Split into simpler sentences: Kip arrives to save him, and Memphis enters the warehouse to settle the score with Calitri, but Calitri faces Castlebeck intending to kill him. Before Calitri can shoot Castlebeck, Memphis pushes him off a balcony ledge, sending Calitri falling to his death.