Complex sentence: He goes back inside the house, tries to call Josie, and upon finding Gus leaving the bathroom, learns that the Reverend shot Gus in the leg, explaining the blood near the corpse.
Split into simpler sentences: He goes back inside the house, tries to call Josie. He then finds Gus and learns that the Reverend shot Gus in the leg, explaining the blood near the corpse.