Complex sentence: Emperor Franz Joseph wanted Mihalović to become Archbishop of Zagreb, but Mihalić at first hesitated because of the complex political situation in Croatia at the time so he decided to resign and seek a transfer to one of the Hungarian diocese.
Split into simpler sentences: Emperor Franz Joseph wanted Mihalović to become Archbishop of Zagreb. Mihalić didn't want that position because of the complex political situation in Croatia of the time so he decided to resign and seek a transfer to one of the Hungarian diocese.