It is not a green card renewal; it is the request for the removal of conditional permanent resident status. The criminal issue is a secondary issue because he is most likely not going to be eligible for the removal of conditions since he is no longer married. Unless he can adequately demonstrate that the marriage was bona fide at the time it was entered into (and the burden of proof is on him to show evidence of this), his status is likely to be revoked and he would be out of status in the US (and would have to depart the US).
Please let me know if you have any additional questions or if I may be of further assistance to you in this matter.
Admitted to practice in CA, AZ, IN and OH