Complex sentence: The NDH took advantage of this chaotic situation, by proclaiming the Treaty of Rome to be void and occupying Italian Dalmatia, but Germans did enter the city before, and on September 10 the German 114 Infantry Division took over.
Split into simpler sentences: The NDH took advantage of this chaotic situation, by proclaiming the Treaty of Rome to be void and occupying Italian Dalmatia. However, the Germans did enter the city, and on September 10 the German 114 Infantry Division took over.