Complex sentence: He participated as a platoon messenger with his division at Arzew in Algeria in rigorous training for the Allied assault landings in Sicily, and was promoted to private first class on 7 May and corporal on 15 July.
Split into simpler sentences: He participated as a platoon messenger with his division at Arzew in Algeria in rigorous training for the Allied assault landings in Sicily. He was promoted to private first class on 7 May and corporal on 15 July.