Complex sentence: Wachovia Center, as the tower was originally named, surpassed Winston Tower as Winston-Salem's tallest building and remained Wachovia's corporate headquarters from its completion date in 1995 to 2001, when Wachovia merged with First Union.
Split into simpler sentences: Wachovia Center, as the tower was originally named, surpassed Winston Tower as Winston-Salem's tallest building. The building remained Wachovia's corporate headquarters from its completion date in 1995 to 2001, when Wachovia merged with First Union.