Complex sentence: She pursued her undergraduate studies at Columbia University where she majored in English literature, and at the Juilliard School, where she studied with John Mack and John Ferrillo.
Split into simpler sentences: She pursued her undergraduate studies at Columbia University where she majored in English literature. Subsequent to graduation, she enrolled at the Juilliard School of Music, where she was a student of John Mack and John Ferrillo.