Complex sentence: With his last ounce of strength, Joffrey points accusingly at Tyrion as his uncle examinines the dropped goblet and then looks up at Cersei one last time before he stops convulsing and dies.
Split into simpler sentences: With his last ounce of strength, Joffrey points accusingly at Tyrion as his uncle examines the dropped goblet. Joffrey then looks up at Cersei one last time before he stops convulsing and dies.