Complex sentence: Public schools are run by the Antioch Unified School District, which consists of two high schools, four middle schools, and numerous elementary schools, and they follow by a single track schedule, with school starting in late August or early september and concludes in June.
Split into simpler sentences: Public schools are run by the Antioch Unified School District, which consists of two high schools, four middle schools, and numerous elementary schools. All schools in the district follow a single track schedule, where school begins in late August or early September and concludes in June.