Complex sentence: John Swett High School is located in Crockett, California, USA, and serves the communities of Crockett, Port Costa, Rodeo, and the Foxboro area of Hercules.
Split into simpler sentences: John Swett High School is located in Crockett, California, United States. It serves the communities of Crockett, Port Costa, Rodeo, and the Foxboro area of Hercules.