Complex sentence: While they were still arguing with his housekeeper, Friedell committed suicide by jumping out of the window, but before that, he warned pedestrians walking on the sideway, where he hit by shouting Watch out !
Split into simpler sentences: While they were still arguing with his housekeeper, Friedell committed suicide by jumping out of the window. Before leaping, he warned pedestrians walking on the sideway where he hit by shouting Watch out!