Complex sentence: Meanwhile, Payton encounters a strange young man named Corporal Gallo, who claims that the ship is lost in space and that he had to kill his rotation team in self-defense because they developed Pandorum after finding out that Earth mysteriously vanished.
Split into simpler sentences: Meanwhile, Payton finds a young man named Corporal Gallo, who claims that the ship is lost in space. He claimed that he kill his team in self-defense because they developed Pandorum after finding out that Earth mysteriously vanished.