Complex sentence: From 1891 to 1893, he was an instructor in gymnastics and athletics at Indiana University where he held the title of Director of the Men's Gymnasium within the Department of Physical Training.
Split into simpler sentences: From 1891 to 1893, he held the position of Physical Director at Indiana University where he was an instructor in gymnastics and athletics. Zink was the Director of the Men's Gymnasium within the Department of Physical Training.