The purpose of prison is to protect society, punish and rehabilitate the person so he can return to society. Prisons do not rehabilitate. If the article is accurate this man has rehabilitated himself, and is no threat to society. If I were the judge I would set him free on an extended probation.
You left our deterring others as a purpose of punishment/prison. There might be a need to make at least some sort of example out of this man to show others that there is no escape from the long arm of the law.