Complex sentence: Further campaigns in 736--737 drove the Moors further south, although Charles failed to recapture Narbonne, which was defended by both its Muslim and Visigoth citizens; however, in 759 Narbonne fell to Pippin, Charles's son.
Split into simpler sentences: Further campaigns in 736--737 drove the Moors further south, although Charles failed to recapture Narbonne, which was defended by both its Muslim and Visigoth citizens. However, in 759 Narbonne fell to Pippin, Charles's son.