Complex sentence: They provide services across 13 sites in Brooklyn, the Bronx, Harlem, and Westchester--where they operate The Graham School, a residential school providing comprehensive and individualized academic and therapeutic supports for students who have struggled in other settings.
Split into simpler sentences: They provide services across 13 sites in Brooklyn, the Bronx, Harlem, and Westchester County. In Westchester, they operate The Graham School, a residential school providing comprehensive and individualized academic and therapeutic supports for students who have struggled in other settings.