Complex sentence: Los Angeles High School is a public secondary high school, enrolling an estimated 2,000 students in grades 9-12 and after operating on a year-round basis consisting of three tracks for ten years, was restored to a traditional calendar in 2010.
Split into simpler sentences: Los Angeles High School is a public secondary high school, enrolling an estimated 2,000 students in grades 9-12. After operating on a year-round basis consisting of three tracks for ten years, it was restored to a traditional calendar in 2010.