Complex sentence: The last abbess, under the Ancien Régime, was Louise Adélaïde de Bourbon, the daughter of Louis Joseph, Prince of Condé; she was prioress of the Monastery of the Temple at her death in 1824.
Split into simpler sentences: The last abbess, under the Ancien Régime, was Louise Adélaïde de Bourbon, the daughter of Louis Joseph, Prince of Condé. She was prioress of the Monastery of the Temple at her death in 1824.