Complex sentence: General Du Yuming, commander of the 5th corps, dispatched two divisions to attacked the Japanese-held Kunlun Pass, and the New 22nd Division cut off Japanese reinforcement from the rear, and killing the Japanese commander, major general Masao Nakamura.
Split into simpler sentences: General Du Yuming, commander of the 5th corps, dispatched two divisions to attack the Japanese-held Kunlun Pass. The new 22nd Division had cut off Japanese reinforcement from the rear and killed the Japanese commander, Major General Masao Nakamura.