Complex sentence: In February 1978, Castellano set up a cooperative agreement between the Gambino family and the Westies, an Irish-American gang from Hell's Kitchen, Manhattan The alliance arose from a meeting between Westies leader James Coonan and Castellano.
Split into simpler sentences: In February 1978, Castellano made agreement between the Gambino family and the Westies, an Irish-American gang from Hell's Kitchen, Manhattan. The Gambino-Westie alliance was set in a meeting between Westies leader James Coonan and Castellano.