Complex sentence: She reportedly accepted his proposal a day after learning from Peter Townsend that he intended to marry a young Belgian woman, Marie-Luce Jamagne, who was half his age and bore a striking resemblance to Princess Margaret.
Split into simpler sentences: She reportedly accepted his proposal a day after learning from Peter Townsend that he intended to marry a young Belgian woman, Marie-Luce Jamagne. She was half his age and bore a striking resemblance to Princess Margaret.