Complex sentence: The town has its own elementary school, known as Addison Central School, serving grades K-6 at the town center, but students in grades 7-12 are taught at Vergennes Union High School in Vergennes.
Split into simpler sentences: The town has its own elementary school, known as Addison Central School, serving students from kindergarten to sixth grade at the town center. Students from seventh to twelfth grade are taught at Vergennes Union High School in Vergennes.