Complex sentence: The Dreams Tower, completed in 2010, became the Adventure Tower; the Wonder Tower will become the Frontier Tower after its completion in 2011; and the Magic Tower will become the Fantasy Tower in 2012.
Split into simpler sentences: The Dreams Tower, completed in 2010, became the Adventure Tower. The Wonder Tower will become the Frontier Tower after its completion in 2011, and the Magic Tower will become the Fantasy Tower in 2012.