Complex sentence: He was responsible for the deaths of an unknown number of people although estimates range in the hundreds, supposedly murdering members of the Medellín Cartel, members of the rival Cali Cartel, police officers and government officials.
Split into simpler sentences: He was responsible for the deaths of an unknown number of people although estimates range in the hundreds. He killed other members of the Medellín Cartel, members of the rival Cali Cartel, police officers and government officials.