Complex sentence: In 1976, the school moved to the Richmondtown area of Staten Island, where it still maintains the boys'school campus; a girls division of the elementary school was established in Staten Island's Graniteville section.
Split into simpler sentences: In 1976, the school moved to the Richmondtown area of Staten Island, where it still maintains the boys'school campus. A girls division of the elementary school was established in Staten Island's Graniteville section.