Complex sentence: Cedric and his girlfriend Hannah have a heated argument which ends in Cedric revealing that he doesn't have any feelings for Hannah anymore, which prompts her to throw a rock at Cedric, wounding his shoulder.
Split into simpler sentences: Cedric and his girlfriend Hannah haven a heated argument which ends in Cedric revealing that he doen't have any feelings for Hannah. Hannah throws a rock at Cedric, wounding his shoulder.