Complex sentence: The current mayor of Patchogue is Paul Pontieri, who was a vice-principal in the neighboring South Country School District's Bellport High School for many years, and also served as a vice-principal at Ward Melville High School in Three Village School District.
Split into simpler sentences: The current mayor of Patchogue is Paul Pontieri, who was a vice-principal of the neighboring South Country School District's Bellport High School for many years. He has also served as a vice-principal at Ward Melville High School, in Three Village School District.