Complex sentence: Their one child together, Mary Dorothea (Dora) Labouchère, had been born in 1884 and later was a daughter-in-law of Emanuele Ruspoli, 1st Prince of Poggio Suasa.
Split into simpler sentences: Their one child together, Mary Dorothea (Dora) Labouchère, had been born in 1884. Dora was daughter-in-law of Emanuele Ruspoli, 1st Prince of Poggio Suasa.