Complex sentence: Arthur Rosenberg was born into a German Jewish middle class family in Berlin on 19 December 1889, he excelled at the Gymnasium before studying at the Friedrich-Wilhelms-Universität in Berlin with Otto Hirschfeld and Eduard Meyer.
Split into simpler sentences: Arthur Rosenberg was born into a German Jewish middle class family in Berlin on 19 December 1889. He excelled at the Gymnasium before studying at the Friedrich-Wilhelms-Universität in Berlin with Otto Hirschfeld and Eduard Meyer.