Complex sentence: For the next three days, Wuhan was bombed by the Americans, destroying all of the docks and warehouses of Wuhan, plus the Japanese air bases in the city while killing thousands of Chinese civilians.
Split into simpler sentences: For the next three days, Wuhan was bombed by the Americans. The American bombing destroyed all of the docks and warehouses of Wuhan, plus the Japanese air bases in the city while killing thousands of Chinese civilians.