Complex sentence: Joaquin and Eléna are taken away by Armand, while McGivens is tasked with killing Alejandro; but unexpectedly, Felipe arrives and helps Alejandro overpower McGivens, who is killed when a drop of nitro lands on his head.
Split into simpler sentences: Joaquin and Eléna are taken away by Armand, while McGivens is tasked with killing Alejandro. Unexpectedly, Felipe arrives and helps Alejandro overpower McGivens, who is killed when a drop of nitro lands on his head.