Complex sentence: The mission of Erding Air Base was changed in 1956 to training personnel for the newly reconstituted German Air Force and the base was turned over to the German Air Force on 1 April 1957.
Split into simpler sentences: The mission of Erding Air Base was changed in 1956 to training personnel for the newly reconstituted German Air Force. The base was turned over to the German Air Force on 1 April 1957.