Complex sentence: He became a pupil of his brother, James Worgan (1715 − 1753), organist of Vauxhall Gardens, and he subsequently studied under Thomas Roseingrave and Geminiani.
Split into simpler sentences: He became a pupil of his brother, James Worgan (1715 − 1753), organist of Vauxhall Gardens. John subsequently studied under Thomas Roseingrave and Geminiani.