Complex sentence: It was the second concentration camp to be liberated following the end of World War II. The United States troops forced the citizens of the local community to come to the camp, observe the conditions, and help clean the facilities.
Split into simpler sentences: It was the second concentration camp to be liberated following the end of WWII. The U.S. troops forced the citizens of the local community to come to the camp, observe the conditions, and help clean the facilities.