Complex sentence: Nanking Massacre denial is denial that Imperial Japanese forces murdered tens of thousands or hundreds of thousands of Chinese soldiers and civilians during the Second Sino-Japanese War, and is a highly controversial episode in Sino-Japanese relations.
Split into simpler sentences: Nanking Massacre denial "" is denial that Imperial Japanese forces murdered tens of thousands or hundreds of thousands of Chinese soldiers? And civilians during the Second Sino-Japanese War, and is a highly controversial episode in Sino-Japanese relations.