Complex sentence: Buttrick White & Burtis was an architecture firm based in New York City, established in 1981 by the architects Harold Buttrick, Samuel G. White and Theodore A. Burtis III, remaining active until 2002.
Split into simpler sentences: Buttrick White & Burtis was an architecture firm based in New York City. The firm was established in 1981 by the architects Harold Buttrick, Samuel G. White and Theodore A. Burtis III, and remained active until 2002.