Complex sentence: His publication of three volumes of documents from the Stuttgart archives gave offence because their contents tended to prove that the immediate dependency of the Württemberg monasteries on the Empire ("Reichsunmittelbarkeit") implied for the local dukes the obligation of restoring the confiscated religious property.
Split into simpler sentences: His publication of three volumes of documents from the Stuttgart archives was tendentious. Their contents suggested that the immediate dependency of the Württemberg monasteries on the Empire ("Reichsunmittelbarkeit") implied for the local dukes the obligation of restoring the confiscated religious property.