Complex sentence: Lady Flora's father was Francis Rawdon-Hastings, 1st Marquess of Hastings (1754-1826), and her mother was Flora Mure-Campbell, 6th Countess of Loudoun (1780-1840).
Split into simpler sentences: Lady Flora's father was Francis Rawdon-Hastings, 1st Marquess of Hastings (1754-1826). Her mother was Flora Mure-Campbell, 6th Countess of Loudoun (1780-1840).