Complex sentence: His first training was as a law stationer, but he then became a land agent and accountant, in 1769 helping in the settlement of Sir Thomas Robinson's tangled estates at Rokeby, Yorkshire.
Split into simpler sentences: His first training was as a law stationer, but he then became a land agent and accountant. In 1769 he helped in the settlement of Sir Thomas Robinson's tangled estates at Rokeby, Yorkshire.