Complex sentence: His paternal grandmother Marie of Berry, Duchess of Bourbon, was heiress to duchy of Auvergne, the creation for the Berry and Bourbon branches made of lands confiscated from counts of Auvergne by Philip II of France.
Split into simpler sentences: His paternal grandmother Marie of Berry, Duchess of Bourbon, was heiress to the duchy of Auvergne. The creation for the Berry and Bourbon branches was made of lands that were confiscated from the count of Auvergne by Philip II of France.