Complex sentence: This role caused some controversy amongst top ranking officers, in particular, the then Commissioner, Martin Callinan, who ordered an inquiry into O'Reilly's appearance in the show, despite the fact that there was no regulatory infringement within the Police Code of conduct.
Split into simpler sentences: This role caused some controversy amongst top ranking officers, in particular, the then Commissioner, Martin Callinan. He ordered an inquiry into O'Reilly's appearance in the show, despite the fact that O'Reilly had not infringed any regulations of the Police Code of conduct.