Complex sentence: They reported that Corrections officials couldn't officially confirm his location, but that some officials had unofficially confirmed he had been transferred to the Bowden institution, medium security penitentiary north of Calgary, Alberta.
Split into simpler sentences: They reported that Corrections officials couldn't officially confirm his location, but that some officials had unofficially confirmed he had been transferred to the Bowden institution. Bowden is a medium security penitentiary north of Calgary, Alberta.