original: Lady Agnes Hay's son, Alexander Duff, married Princess Louise, daughter of King Edward VII.
simplifications: Lady Agnes Hay's son married the daughter of King Edward VII. Lady Agnes Hay's son, Alexander Duff, married Princess Louise. She is the daughter of King Edward VII. Alexander Duff wed King Edward VII's daughter Louise. Alexander Duff was the son of Lady Agnes Hay. He married Princess Louise. She was the daughter of King Edward VII. Lady Agnes Hay's son was Alexander Duff. He married Princess Louise, who was the daughter of King Edward VII. Lady Agnes Hay's son was Alexander Duff. He wed Princess Louise, daughter of King Edward VII. Alexander Duff married Princess Louise, daughter of King Edward VII. Alexander Duff married Princess Louise. Princess Louise (daughter of King Edward VIII) married Alexander Duff (Son of Lady Agness Hay). Alexander Duff, son of Lady Agnes Hay, married Princess Louise, daughter of King Edward VII.