Complex sentence: Prévost trained two highly successful dancers, Marie Camargo (1710--1770) and Marie Sallé (1707--1756), who adapted the "Caractères" to their own personal taste, taking her place as prima ballerinas after she retired from the opera in 1730.
Split into simpler sentences: Prévost trained two highly successful dancers, Marie Camargo (1710--1770) and Marie Sallé (1707--1756), each adding their personal preferences to her "Caractères". They would take her place as prima ballerinas after she retired from the opera in 1730.