Complex sentence: Silas was organist at the Catholic Chapel of Kingston upon Thames and Professor of Harmony at the Guildhall School of Music and a composer of symphonies, piano concertos, string quartets and organ works.
Split into simpler sentences: Silas was organist at the Catholic Chapel of Kingston upon Thames and Professor of Harmony at the Guildhall School of Music. He was a composer of symphonies, piano concertos, string quartets and organ works.