Complex sentence: Maud's paternal grandparents were William le Vavasour, Lord of Hazelwood, and Justiciar of England, and Matilda Perry, and her maternal grandparents were Gilbert de Ros and Matilda de Cauz.
Split into simpler sentences: Maud's paternal grandparents were William le Vavasour, Lord of Hazelwood, and Justiciar of England, and Matilda Perry. Her maternal grandparents were Gilbert de Ros and Matilda de Cauz.