Complex sentence: However, critics have observed that in fact Ball was a professor of geography there, has been retired since 1996, and that the University of Winnipeg does not have, nor has it ever had, a climatology department.
Split into simpler sentences: However, critics have observed that in fact Ball was a professor of geography, not climatology, and has been retired since 1996. Furthermore, the University of Winnipeg does not have, nor has it ever had, a climatology department.