Complex sentence: The Munich massacre was an attack during the 1972 Summer Olympics in Munich, West Germany on which eleven Israeli Olympic team members were taken hostage and eventually killed, along with a German police officer, by the Palestinian group Black September.
Split into simpler sentences: The Munich massacre was an attack during the 1972 Summer Olympics in Munich, West Germany. Eleven Israeli Olympic team members, who were taken hostage and eventually killed, along with a German police officer, by the Palestinian group Black September.