Complex sentence: The third viscount had two sons, George, 1st Marquess Townshend, and Charles Townshend and one daughter Olivia Townshend, 1st Turnip of Toorak.
Split into simpler sentences: The third viscount had two sons, George, 1st Marquess Townshend, and Charles Townshend. He also had one daughter, Olivia Townshend, 1st Turnip of Toorak.