Complex sentence: After the Second World War ended, Churchill qualified as a parachutist, transferred to the Seaforth Highlanders, and was soon posted to Palestine as second-in-command of the 1st Battalion, the Highland Light Infantry.
Split into simpler sentences: After the Second World War ended, Churchill qualified as a parachutist, transferred to the Seaforth Highlanders. He was soon posted to Palestine as second-in-command of the 1st Battalion, the Highland Light Infantry.