Complex sentence: Over of the family's estates were sold to meet debts; the only property remaining in the control of the Grenville family was the family's relatively small ancestral home of Wotton House and its associated lands around Wotton Underwood near Brill.
Split into simpler sentences: Over of the family's estates were sold to meet debts. The only property remaining in the control of the Grenville family was the family's relatively small ancestral home of Wotton House and its associated lands around Wotton Underwood near Brill.