Complex sentence: He followed Rameau as the conductor of a private orchestra kept by the "fermier général" Le Riche de La Poupelinière, a wealthy amateur and great patron of music, and became gradually determined to do something to revive the study of instrumental music in France.
Split into simpler sentences: He followed Rameau as the conductor of a private orchestra kept by the "fermier général" Le Riche de La Poupelinière, a wealthy amateur and patron of music. Gradually he became determined to do something to revive the study of instrumental music in France.