Complex sentence: In 1753, he was invited to London by the Prince of Wales, later George III, and the Duke of York, on his return to England he married his second wife, Sarah Horne who was a sister of John Horne Tooke.
Split into simpler sentences: In 1753, he was invited to London by the Prince of Wales, later George III, and the Duke of York. On his return to England he married his second wife, Sarah Horne, who was a sister of John Horne Tooke.