Complex sentence: The Seminole Tribe of Florida operates a sizable casino at the community of Brighton on the reservation, which has a land area of 147,862 km² (57,090 sq mi) and a 2000 census resident population of 566 persons.
Split into simpler sentences: The Seminole Tribe of Florida operates a sizable casino at the community of Brighton on the reservation. The reservation has a land area of 147,862 km² (57,090 sq mi) and a 2000 census resident population of 566 persons.