Complex sentence: In addition, San Diego is the only metropolitan area in the U.S. where Filipinos constitute the largest Asian American nationality, has historically been a popular destination for Filipino immigrants, and has contributed to the growth of its population.
Split into simpler sentences: In addition, San Diego is the only metropolitan area in the U.S. where Filipinos constitute the largest Asian American nationality. It has historically been a popular destination for Filipino immigrants, and has contributed to the growth of its population.