Complex sentence: He worked as a musician in the cathedral at Antwerp, where he was in charge of the music for the services, and in 1737 he returned to Brussels and worked in the Church of St. Gudule.
Split into simpler sentences: He worked as a musician in the cathedral at Antwerp, where he was in charge of the music for the services. In 1737 he returned to Brussels and worked in the Church of St. Gudule.