Complex sentence: Dobratsch Transmitter Tower was built in 1971 and similiarly to Gerbrandy Towerconsists of a concrete tower, which carries a guyed steel tube mast on the top.
Split into simpler sentences: Dobratsch Transmitter Tower was built in 1971 and is similar to the Gerbrandy Tower. It consists of a concrete tower which carries a guyed steel tube mast on the top.