Complex sentence: Her mother was born Maud Alice Burke (1872-1948), and was an American heiress; as Lady Emerald Cunard, she became a leading London socety hostess, and later celebrated as a friend of Wallis Simpson.
Split into simpler sentences: Her mother was born Maud Alice Burke (1872-1948), and was an American heiress. As Lady Emerald Cunard, she became a leading London society hostess, and later celebrated as a friend of Wallis Simpson.