Complex sentence: Gerald Wellesley, 11-year-old son of the Duke's brother Henry Wellesley, 1st Baron Cowley and his estranged wife Lady Charlotte Cadogan, was adopted by the Duchess of Wellington and lived with the rest of the family at Stratfield Saye House in Hampshire.
Split into simpler sentences: Gerald Wellesley, 11-year-old son of the Duke's brother Henry Wellesley, 1st Baron Cowley and his estranged wife Lady Charlotte Cadogan. He had been adopted by the Duchess of Wellington and lived with the rest of the family at Stratfield Saye House in Hampshire.