Complex sentence: With the rest of the division, they left the United Kingdom in late August 1942, being sent to Persia and Iraq Command and the battalion later fought in the final battle in the Tunisia Campaign in April 1943.
Split into simpler sentences: With the rest of the division, they left the United Kingdom in late August 1942. The division was sent to Persia and Iraq Command and the battalion later fought in the final battle in the Tunisia Campaign in April 1943.