Complex sentence: Dozens of ambulances and a hundred doctors arrived at the scene, the injured being taken to four different hospitals where a shortage of blood and plasma resulted in an appeal for blood donors to which 1500 people responded.
Split into simpler sentences: Dozens of ambulances and a hundred doctors arrived at the scene. The injured were taken to four different hospitals where a shortage of blood and plasma resulted in an appeal for blood donors to which 1500 people responded.