Complex sentence: She attended the Francis Holland School in Central London, and the Christian Science School, Claremont, in Esher, Surrey, and then she was "finished" in Paris where she attended Mlle Ozanne's finishing school at the age of seventeen.
Split into simpler sentences: She attended the Francis Holland School in Central London, and the Christian Science School, Claremont, in Esher, Surrey. She was "finished" in Paris where she attended Mlle Ozanne's finishing school at the age of seventeen.