Complex sentence: He sits on his bike on the side of a building, suddenly explosives he set up blow a large hole in the side of the school he attends he seems remorseless as he calmly rides his bike home.
Split into simpler sentences: He sits on his bike on the side of a building, suddenly explosives he set up blow a large hole in the side of the school he attends. He seems remorseless as he calmly rides his bike home.