Complex sentence: After the Polish campaign, his unit was absorbed into the newly formed SS Division Totenkopf, where he served as a battalion commander during the Campaign in the West, receiving the Iron Cross First Class for his bravery in combat.
Split into simpler sentences: After the Polish campaign, his unit was absorbed into the newly formed SS Division Totenkopf. He led this formation through the initial phase of the Campaign in the West, receiving the Iron Cross First Class for his bravery in combat.