Complex sentence: It first was located on the Herbert H. Lehman campus, but moved after its first school year to the Adlai E. Stevenson campus, located at 1980 Lafayette Avenue, in the Bronx.
Split into simpler sentences: It first was located on the Herbert H. Lehman campus, but moved after its first school year to the Adlai E. Stevenson campus. Which is located at 1980 Lafayette Avenue, in the Bronx.