Complex sentence: In fact, Prince Richard, Duke of Gloucester was the senior agnate of the House of Saxe-Corug-Gotha; but the Prince of Wales (later King Edward VII of the United Kingdom) renounced to his succesion rights for him and his descendants.
Split into simpler sentences: In fact, Prince Richard, Duke of Gloucester was the senior agnate of the House of Saxe-Corug-Gotha. But the them Prince of Wales (later King Edward VII of the United Kingdom) renounced to his succesion rights for him and his descendants.