Complex sentence: The war crimes of August 1914 are often dismissed as British propaganda.Modern historians are likely to be, in some cases, less confident that reports of rape and other attrocities were wholesale fabrications, which was assumed in the 1920s and 1930s.
Split into simpler sentences: The war crimes of August 1914 are often dismissed as British propaganda. Some modern historians are likely to be in some cases less confident that reports of rape were wholesale fabrications, which was assumed in the 1920s and 1930s.