Complex sentence: The camp's population initially included British, Canadian, American, Australian, Dutch and other citizens who were forced to stay in the camp for nearly two and a half years until American forces liberated them on August 17,1945.
Split into simpler sentences: The camp's population initially included British, Canadian, American, Australian, Dutch and other citizens. In total, Weihsien remained in operation for nearly two and a half years until American forces liberated the camp on August 17,1945.