Complex sentence: While most of the 500 shapes created by 1911 were the product of Gates' efforts, many of the remaining Teco designs were the work of a group of young Chicago architects that were involved in the Prairie School style as defined by Frank Lloyd Wright.
Split into simpler sentences: While most of the 500 shapes created by 1911 were the product of Gates efforts. Many of the remaining Teco designs were the work of a group of young Chicago architects that were involved in the Prairie School style as defined by Frank Lloyd Wright.