Complex sentence: Catherine (1468--12 February 1517) was Queen of Navarre (1483--1517), duchess of Gandia, Montblanc, and Peñafiel, countess of Foix, Bigorre, and Ribagorza, and viscountess of Béarn.
Split into simpler sentences: Catherine (1468--12 February 1517), Queen of Navarre, reigned from 1483 until 1517. She was also Duchess of Gandia, Montblanc, and Peñafiel, Countess of Foix, Bigorre, and Ribagorza, and Viscountess of Béarn.