Complex sentence: Count Frederick III of Zollern was a loyal retainer of the Holy Roman Emperors Frederick Barbarossa and Henry VI, and around 1185 he married Sophia of Raabs, the daughter of Conrad II, Burgrave of Nuremberg.
Split into simpler sentences: Count Frederick III of Zollern was a loyal retainer of the Holy Roman Emperors Frederick Barbarossa and Henry VI. In about 1185 he married Sophia of Raabs, the daughter of Conrad II, Burgrave of Nuremberg.