Complex sentence: She was subsequently adopted by Lewis Edward Upcott, a teacher at Marlborough College, and his wife Emily who sent her to be educated at St. Nicholas's, Folkestone, and then at the exclusive Château Lutry in Switzerland.
Split into simpler sentences: She was subsequently adopted by Lewis Edward Upcott, a teacher at Marlborough College, and his wife Emily. Elsie was educated at St. Nicholas's, Folkestone, and then at the exclusive Château Lutry in Switzerland.