Complex sentence: Beginning in June, 1935 Hahn worked as a clerk at the "SD-Hauptamt" in Berlin in January, 1936 and was appointed assistant director of the Gestapo office in Hanover.
Split into simpler sentences: Beginning in June, 1935 Hahn worked as a clerk at the "SD-Hauptamt" in Berlin. In January, 1936 he was appointed assistant director of the Gestapo office in Hanover.