Complex sentence: Max Zorn was appointed as an assistant at the University of Halle but he did not have the opportunity to work there for long since, in 1933, he was forced to leave Germany because of the Nazi policies.
Split into simpler sentences: Max Zorn was appointed as an assistant at the University of Halle. However, he did not have the opportunity to work there for long since, he was forced to leave Germany in in 1933 because of the Nazi policies.