Complex sentence: After his parents returned to India, Tharoor boarded at Montfort School in Yercaud (1962), subsequently moving to Bombay (now Mumbai) and studying at the Campion School (1963--68).
Split into simpler sentences: After his parents returned to India, Tharoor was briefly sent to Montfort School, a boarding school in Yercaud (1962-63). The family subsequently moved to Bombay (now Mumbai), and Tharoor studied at the Campion School (1963--68).