Complex sentence: Then when the Stouts show up and clam to be stuarts parents and annonce to take him away, George is the one the one who throws the biggest fitt but he does however return to give stuart his Roadster (automobile) before he leaves.
Split into simpler sentences: Then when the Stouts show up, clam to be Stuarts' parents and try to take him away, George is the one the one who throws the biggest fit. He does however return to give Stuart his Roadster (automobile) before he leaves.