Complex sentence: Her ancestry is unclear, with David Crouch stating she was a member of the de Lacy family, and the "Complete Peerage" states she was probably the daughter of Walter de Lacy and Emma, and sister of Roger and Hugh de Lacy.
Split into simpler sentences: Her ancestry is unclear, with David Crouch stating she was a member of the de Lacy family. The "Complete Peerage" states she was probably the daughter of Walter de Lacy and Emma, and sister of Roger and Hugh de Lacy.