Complex sentence: Starting in 1670, Marc-Antoine Charpentier composed and sang haute-contre in her service, and her patronage fostered a number of major works, most of them devotional and strongly influenced by Italian music.
Split into simpler sentences: Starting in 1670, Marc-Antoine Charpentier composed for her and sang haute-contre in her service. Her patronage fostered a number of major works, most of them devotional and strongly influenced by Italian music.