Complex sentence: Her second name is the name of her paternal great-grandmother, Queen Elizabeth, as well as the middle name of both her mother and maternal grandmother, Carole Middletonand her third name, Diana, honours her late paternal grandmother Diana, Princess of Wales.
Split into simpler sentences: Her second name is the name of her paternal great-grandmother, Queen Elizabeth, as well as the middle name of both her mother and maternal grandmother, Carole Middleton. Her third name, Diana, honours her late paternal grandmother Diana, Princess of Wales.