Complex sentence: Jeanne's paternal grandparents were John, Count of Angoulême and Marguerite de Rohan, and her maternal grandparents were Foucaud de Polignac, Seigneur des Fontaines and Agnès de Chabanais, daughter of Jean de Chabanais and Marguerite Chauvet.
Split into simpler sentences: Jeanne's paternal grandparents were John, Count of Angoulême and Marguerite de Rohan. Her maternal grandparents were Foucaud de Polignac, Seigneur des Fontaines and Agnès de Chabanais, daughter of Jean de Chabanais and Marguerite Chauvet.