Complex sentence: On one occasion, McQueen was caught stealing hubcaps by police, who handed him over to his stepfather who beat him severely, ending the fight by throwing McQueen down a flight of stairs.
Split into simpler sentences: On one occasion, McQueen was caught stealing hubcaps by police, who handed him over to his stepfather. The latter proceeded to beat McQueen severely, and ended the fight by throwing McQueen down a flight of stairs.