Complex sentence: Puerto Ricans and Dominicans are predominant in Bushwick, Williamsburg, and East New York, while Mexicans are predominant in Sunset Park and Panamanians in Crown Heights.
Split into simpler sentences: Puerto Ricans and Dominicans are predominant in Bushwick, Williamsburg, and East New York. While Mexicans are predominant in Sunset Park and Panamanians in Crown Heights.