Complex sentence: After 1943, the Projector, Infantry, Anti Tank known as the PIAT replaced the by then ineffective Boys ant-tank rifle and with the formation of the heavy weapons troops, Commandos were issued with the 3-inch mortar and the Vickers machine gun.
Split into simpler sentences: After 1943, the Projector, Infantry, Anti Tank, known as the PIAT, replaced the by then ineffective Boys ant-tank rifle. With the formation of the heavy weapons troops, Commandos were issued the 3-inch mortar and the Vickers machine gun.