Complex sentence: The 4th Mixed Brigade of the Imperial Japanese Army was a detachment from the 8th Division, in November 1931 to Heilongjiang province to reinforce the Invasion of Manchuria.
Split into simpler sentences: The 4th Mixed Brigade was a military unit of the Imperial Japanese Army. This Mixed Brigade was a detachment from the 8th Division, in November 1931 to Heilongjiang province to reinforce the Invasion of Manchuria.