Complex sentence: Millbrook High School part of the Millbrook Central School System (grades 9-12) located in Millbrook, Dutchess County, New York is located at 70 Church Street, Millbrook, NY.
Split into simpler sentences: Millbrook High School is a part of the Millbrook Central School System (grades 9-12). The address of the school is 70 Church Street, Millbrook, NY.