Complex sentence: Her paternal grandparents were Gilla Comgaill O'Toole and Sadb Mael Morda O'Domnail, and her maternal grandparents were Loigsig O'Morda, King of Loigsig and Gormlaith "Inion" Finn O'Caellaide (O'Kelly).
Split into simpler sentences: Her paternal grandparents were Gilla Comgaill O'Toole and Sadb Mael Morda O'Domnail. Her maternal grandparents were Loigsig O'Morda, King of Loigsig and Gormlaith "Inion" Finn O'Caellaide (O'Kelly).