Complex sentence: In 792, Regensburg hosted the ecclesiastical section of Charlemagne's General Assembly, the bishops in council who condemned the heresy of adoptionism taught by their Spanish counterparts, Elipandus of Toledo and Felix of Urgel.
Split into simpler sentences: In 792, Regensburg hosted the ecclesiastical section of Charlemagne's General Assembly. The bishops in council condemned the heresy of adoptionism taught by the Spanish bishops, Elipandus of Toledo and Felix of Urgel.