Complex sentence: Naperville Central High School (Naperville Central or NCHS) is an American public four-year comprehensive school covering grades nine through twelve located in Naperville, Illinois, a suburb southwest of Chicago.
Split into simpler sentences: Naperville Central High School (Naperville Central or NCHS) is a four-year state school high school consisting of grades nine through twelve. The school is located in Naperville, Illinois, a suburb southwest of Chicago.