Complex sentence: The Rape of Nanking is another example of Japanese atrocity committed on a civilian population where hundreds of thousands of men were slaughtered, while women of all ages were systematically raped and/or killed by Japanese soldiers.
Split into simpler sentences: The Rape of Nanking is another example of atrocity committed by Japanese soldiers on a civilian population. Hundreds of thousands of men were slaughtered, while women of all ages were systematically raped and/or killed by Japanese soldiers.