Complex sentence: Bernard Spitzer (born 1924) is an American real estate developer and philanthropist in New York City who built several landmark buildings around the city including The Corinthian which was the largest individual apartment building in New York City when it was built.
Split into simpler sentences: Bernard Spitzer (born 1924) is an American real estate developer and philanthropist. He is based in New York City where he operates apartment buildings and built several landmark buildings around the city including The Corinthian which was the largest individual apartment building in New York City when it was built.