Complex sentence: With his cover blown, Phelps tries to kill Ethan but Claire intervenes and Phelps kills her and then tries to escape with the money by climbing to the roof of the train, where Krieger is waiting with a helicopter with a tether.
Split into simpler sentences: With his cover blown, Phelps tries to kill Ethan but Claire intervenes and Phelps kills her. He then tries to escape with the money by climbing to the roof of the train, where Krieger is waiting with a helicopter with a tether.