Complex sentence: On July 8, Drucci and another gunman murdered Anthony Genna, and on November 13 they murdered Genna gunman Samuzzo Amatuna in a barber shop.
Split into simpler sentences: On July 8, Drucci and a second gunman murdered Anthony Genna. On November 13, they murdered Genna gunman Samuzzo Amatuna in a barber shop.