Complex sentence: Since the release of "Michael Collins" in 1996, which was rated PG (but upgraded to 12 for video/DVD), and despite its depictions of extreme violence, the censors office has reduced age ratings in general and rarely cuts films.
Split into simpler sentences: Since the release of "Michael Collins" in 1996, which was rated PG for it's theatrical release, despite its depictions of extreme violence (it was upgraded to a 12 for the video/DVD releases). Since then, the censors office has reduced age ratings in general and rarely cuts films.