Complex sentence: The Japanese 33rd Mixed Brigade was a detachment of the Imperial Japanese Army 10th Division commanded by Major Gen. Nakamura in the Battle of Rehe in the battle along the Great Wall in 1933.
Split into simpler sentences: The Japanese 33rd Mixed Brigade was a was a military unit of the Imperial Japanese Army. This Mixed Brigade was a detachment of the IJA 10th Division commanded by Major Gen. Nakamura in the Battle of Rehe in the battle along the Great Wall in 1933.