Complex sentence: Mathieu's grandson took over the family business in 1789 and was also an active politician, serving on the Grenoble city council during the French Revolution and later as the Deputy for Isère in the French Parliament.
Split into simpler sentences: Mathieu's grandson took over the family business in 1789. He was also an active politician, serving on the Grenoble city council during the French Revolution and later as the Deputy for Isère in the French Parliament.