Complex sentence: Her grandson Robert Bulwer-Lytton, 1st Earl of Lytton, served as Viceroy of India from 1876 to 1880, and two of her great grandsons became the second and third Earls of Lytton.
Split into simpler sentences: Her grandson Robert Bulwer-Lytton, 1st Earl of Lytton served as Viceroy of India from 1876 to 1880. Her great grandsons became the second and third Earls of Lytton.