Complex sentence: Luna Park closed in 1946 after a series of fires, an increase of prostitution in the area, and the New York street gang problems of the 1950s spilled into Coney Island.
Split into simpler sentences: Luna Park closed in 1946, after a series of fires. There was an increase in prostitution in the area, and the New York street gang problems of the 1950s also spilled over into Coney Island.