Complex sentence: Lomax writes that Bamber has had several psychological assessments but the psychiatrist couldn't find any traits of psychopathy, although that it would be discovered by the media through him being a Category A prisoner as he has refused to accept his guilt.
Split into simpler sentences: Lomax writes that Bamber has had several psychological assessments, and has reportedly been found not to have traits suggestive of psychopathy. He remains a Category A prisoner because he has refused to accept his guilt.