Complex sentence: Kylo refuses and kills Han, enraging Chewbacca, who shoots Kylo and sets off the explosives, allowing the Resistance to attack and destroy Starkiller Base.
Split into simpler sentences: Kylo refuses and kills Han, enraging Chewbacca, who fires and hits Kylo. Chewbacca sets off the explosives, allowing the Resistance to attack and destroy Starkiller Base.