Complex sentence: After negotiating with some Saxon nobles and obtaining hostages, Charlemagne turned his attention to his war against the Lombards in northern Italy; but Saxon free peasants, led by Widukind, continued to resist and raided Frankish lands in the Rhine region.
Split into simpler sentences: After negotiating with some Saxon nobles and obtaining hostages, Charlemagne turned his attention to his war against the Lombards in northern Italy. But Saxon free peasants, led by Widukind, continued to resist and raided Frankish lands in the Rhine region.