original: The Congress of Vienna recognized it as a grand duchy and member of the German Confederation.
simplifications: the Vienna Congress recognized it as a member of the German Confederation. The Congress of Vienna recognized it as a member of the German Confederation. Vienna's Congress recognized it as a grand member of the German Confederation. The Congress of Vienna accepted it as a grand duchy and part of the German Confederation. The Congress of Vienna recognized it as a grand duchy and German Confederation member. The Congress of Vienna recognized it as a grand duchy. It was also in the German Confederation. It was recognized as a grand duchy and member of the German Confederation in the Congress of Vienna. The Congress of Vienna recognized it. The Congress of Vienna recognized it as a  member of the German Confederation. It was viewed by the Vienna Congress as a Grand Duchy and a member of the German Confederation.