Complex sentence: Jeanne then sold the de Clisson estates and raised a force of loyal men and started attacking French forces in Brittany, including the garrison of Château-Thébaud, about 20km south east of Nantes and a former post under control of her husband.
Split into simpler sentences: Jeanne then sold the de Clisson estates and raised a force of loyal men and started attacking French forces in Brittany. Jeanne attacked the garrison of Château-Thébaud, about 20km south east of Nantes and a former post under control of her husband.