Complex sentence: He was commissioned in the Indian Army as a 2nd Lieutenant on 21 June 1942 and soon, thereafter, joined the 1st Battalion, 2nd Punjab Regiment in the British Middle East Command.
Split into simpler sentences: He was commissioned in the Indian Army as a 2nd Lieutenant on 21 June 1942. Soon thereafter he joined the 1st Battalion, 2nd Punjab Regiment in the British Middle East Command.