Complex sentence: Fürstenberg is the name of a German noble family of Westphalia, descended from one "Hermanus de Vorstenberg", a liegeman of the Archbishop of Cologne, who was among the prince electors of the Holy Roman Empire.
Split into simpler sentences: Fürstenberg is the name of a German noble family of Westphalia, which descended from "Hermannus de Vorstenberg". He was a liegeman of the Archbishop of Cologne, who was among the prince electors of the Holy Roman Empire.