Complex sentence: She was the daughter of vicomte Adrien-Ange de Walckiers de Tronchiennes and Dieudonne de Nettine, and the granddaughter of Barbe de Nettine: her brother Edouard de Walckiers was a member of the local financial authorities.
Split into simpler sentences: She was the daughter of vicomte Adrien-Ange de Walckiers de Tronchiennes and Dieudonne de Nettine, and the granddaughter of Barbe de Nettine. Her brother Edouard de Walckiers was a member of the local financial authorities.