Complex sentence: After training as a jockey at Newmarket, he took some lessons in harmony from Francisco Bianchi in London, and in 1804 wrote the music to a piece called "Angelina", which was performed at Margate.
Split into simpler sentences: After training as a jockey at Newmarket, he took some lessons in harmony from Francisco Bianchi in London. In 1804 he wrote the music to a piece called "Angelina", which was performed at Margate.