Complex sentence: James Amster (July 18,1908-June 11,1986) was an interior decorator in New York City in the 1960s who created the Amster Yard, a New York Historic Landmark.
Split into simpler sentences: James Amster (July 18,1908-June 11,1986) was an interior decorator in New York City in the 1960s. He was the creator of Amster Yard, a New York Historic Landmark.