Complex sentence: Hirschfeld is known as one of the most prominent collectors of art in New York, as some of his notable works include Andy Warhol's "Brooklyn Bridge" and Karel Appel's "Untitled".
Split into simpler sentences: Hirschfeld is known as one of the most prominent collectors of art in New York. Some of his notable works include Andy Warhol's "Brooklyn Bridge" and Karel Appel's "Untitled".