Complex sentence: One Shell Plaza was designed by the architectural firm of Skidmore, Owings & Merrill of One Shell Plaza were Wilson, Morris, Crain & Anderson, and the landscape architects were Sasaki Associates.
Split into simpler sentences: One Shell Plaza was designed by the architectural firm of Skidmore, Owings & Merrill. Associate architects were Wilson, Morris, Crain & Anderson, and the landscape architects were Sasaki Associates.