Complex sentence: From 1869 to 1924 approximately 200,000 immigrated to the islands of Hawaii, mostly laborers arriving to work on the islands' sugar plantations, and 180,000 went to the U.S. mainland, with the majority settling on the West Coast and establishing farms or small businesses.
Split into simpler sentences: From 1869 to 1924 approximately 200,000 immigrated to the islands of Hawaii, mostly laborers arriving to work on the islands' sugar plantations. Some 180,000 went to the U.S. mainland, with the majority settling on the West Coast and establishing farms or small businesses.