Complex sentence: Through her daughter Isabella, Beatriz is an ancester of many diffrent monarchs, her great granddaughter was Isabella I of Castile, Isabella was the mother of Maria of Aragon, Catherine of Aragon and Joanna of Castile.
Split into simpler sentences: Through her daughter Isabella, Beatriz is an ancester of many different monarchs. Her great granddaughter was Isabella I of Castile, Isabella was the mother of Maria of Aragon, Catherine of Aragon and Joanna of Castile.