Complex sentence: This tower was built in 1937 as 53 meters high reinforced concrete construction with an upper section built of wood and which should serve after 1939 as television tower for the Rhine Main area, but because World War II it was transfered into a radar station.
Split into simpler sentences: This tower was built in 1937 as a 53m high reinforced concrete construction with an upper section built of wood. After 1939 it beacame a television tower for the Rhine Main area, but during World War II it became into a radar station.