Complex sentence: According to the Republic of the Fiji Islands' 31 December 2004 estimate, 38.1 percent of the population of Fiji is Indo-Fijian, and 79.8 percent of Indo-Fijians are Hindus (with the rest being Sikhs, Muslims or Christians).
Split into simpler sentences: According to the Republic of the Fiji Islands' December 31,2004 estimate, 38.1 percent of the population of Fiji is Indo-Fijian. Meanwhile, 79.8 percent of Indo-Fijians are Hindus (with the rest being Sikhs, Muslims, or Christians).