Complex sentence: Her maternal grandmother Janie Sheffield was lady-in-waiting to Princess Margaret, and her paternal great-grandfather was the Canadian-born British politician Hamar Greenwood, 1st Viscount Greenwood.
Split into simpler sentences: Her maternal grandmother Janie Sheffield was lady-in-waiting to Princess Margaret. Her paternal great-grandfather was the Canadian-born British politician Hamar Greenwood, 1st Viscount Greenwood.