Complex sentence: Her father placed her in a convent boarding school, the Sacre-Coeur, where she remained for six years, her only pleasure being the piano lessons she took one day a week as the student of the eminent Gabriel Fauré.
Split into simpler sentences: Her father placed her in a convent boarding school, the Sacre-Coeur. She remained there for six years, her only pleasure being the piano lessons she took one day a week as the student of the eminent Gabriel Fauré.