Complex sentence: After the Manchurian Incident in September 1931, the 20th Division was reinforced by the addition of the IJA 29th Infantry Regiment and the division was stationed in the Liaodong Peninsula at Jinzhou.
Split into simpler sentences: After the Manchurian Incident, its strength was increased by the addition of the 29th Infantry Regiment. In 1931, the 20th Division was stationed in the Liaodong Peninsula at Jinzhou.