Complex sentence: Her paternal grandparents were Ramón Barbosa Aguilar and Marcelina Mendoza Montaño; and maternal grandparents were Manuel Curiel de Sárate and Juana Ramos Aumada.
Split into simpler sentences: Her paternal grandparents were Ramón Barbosa Aguilar and Marcelina Mendoza Montaño. Her maternal grandparents were Manuel Curiel de Sárate and Juana Ramos Aumada.