Complex sentence: He learnt to play the trumpet at the age of five, became a pupil at the Conservatoire de Charleville-Mézières in 1984, and gained his diploma at the Conservatoire de Nancy in 1989.
Split into simpler sentences: He learnt to play the trumpet at the age of five. He became a pupil at the Conservatoire de Charleville-Mézières in 1984, and gained his diploma at the Conservatoire de Nancy in 1989.