Complex sentence: In 1966, the Church purchased the former Crescent Athletic Club House, a building designed by noted Brooklyn architect Frank Freeman, for the sum of $365,000, which has since served as the school's main building.
Split into simpler sentences: In 1966, the Church purchased the former Crescent Athletic Club House, a building designed by the noted Brooklyn architect Frank Freeman, for the sum of $365,000. It has since served as the school's main building.