Complex sentence: He would rule the Burgundian lands jointly with Mary, vowing to uphold the privileges granted to the towns and cities, but the presence of German and other foreign troops caused riots in Ghent in 1478.
Split into simpler sentences: He would rule the Burgundian lands jointly with Mary, vowing to uphold the privileges granted to the towns and cities. The presence of German and other foreign troops caused riots in Ghent already in 1478.