Complex sentence: During the war, Schmeling being a paratrooper participated in the 1941 Battle of Crete, was wounded, and, after recovery and dismissed from active service, visited American P.O.W. camps and occasionally tried to help conditions for the prisoners.
Split into simpler sentences: During the war, Schmeling participated in the 1941 Battle of Crete, where he was wounded and after recovery was dismissed from active service. He later visited American P.O.W. camps and occasionally tried to help conditions for the prisoners.