Complex sentence: He wrote a large number of symphonic, band, choral and chamber works, as well as zarzuelas and operas, becoming-alongside Tomás Bretón a fellow pupil of Emilio Arrieta at the Madrid Conservatoire-one of the most popular and important composers of his time.
Split into simpler sentences: He wrote a large number of symphonic, band, choral and chamber works, as well as zarzuelas and operas, becoming, alongside Tomás Bretón, a fellow pupil of Emilio Arrieta at the Madrid Conservatoire. He was one of the most popular and important composers of his time.