Complex sentence: After the marriage of her aunt Élisabeth Charlotte d'Orléans, Louise Adélaïde was known at court as "Mademoiselle de Chartres"; she assumed the style of "Mademoiselle d'Orléans" in 1710 after her older sister Marie Louise Élisabeth d'Orléans married Charles, Duke of Berry.
Split into simpler sentences: After the marriage of her aunt Élisabeth Charlotte d'Orléans, Louise Adélaïde was known at court as "Mademoiselle de Chartres". She assumed the style of "Mademoiselle d'Orléans" in 1710 after her older sister Marie Louise Élisabeth d'Orléans married Charles, Duke of Berry.