Complex sentence: He volunteered to join the SS and was posted to the SS-VT he took part in the Battle of France as an Infantry platoon commander and was awarded the Iron Cross 1st and 2nd class.
Split into simpler sentences: He volunteered to join the SS and was posted to the SS-VT. He took part in the Battle of France as an Infantry platoon commander and was awarded the Iron Cross 1st and 2nd class.