Complex sentence: In the 13th, Walcott used his trademark feint to set up his right hand, but Marciano's "Suzie Q" landed first, a powerful right hook causing Walcott to slump to his knees with his arm draped over the ropes.
Split into simpler sentences: In the 13th, Walcott used his trademark feint to set up his right hand, but Marciano's "Suzie Q" landed first. Marciano landed a powerful right hook causing Walcott to slump to his knees with his arm draped over the ropes.