Complex sentence: In 1763 James Townsend married Henrietta Rosa Peregrina du Plessis, the illegitimate daughter of Henry Hare, 3rd Baron Coleraine and Rose du Plessis Henrietta Rosa was her father's heiress but the estate had escheated to the Crown because she was an alien.
Split into simpler sentences: In 1763 James Townsend married Henrietta Rosa Peregrina du Plessis, the illegitimate daughter of Henry Hare, 3rd Baron Coleraine. She was her father's heiress, but the estate had escheated to the Crown because she was an alien.