No, he can not. If he has been married before, he is free to marry in the Church only if his previous spouse has died or he has obtained a declaration of nullity from the Church for his original marriage. The mere fact of a divorce is not sufficient to prove the nullity of a marriage. During marriage preparation, you must inform the priest if you have been married before, even if in a civil ceremony. Even if the first marriage is found to be void, if you are not baptized, no marriage can proceed unless you receive a dispensation from the Local Ordinary (Bishop of Diocese), and if you are baptized though non-Catholic you must receive permission from the Local Ordinary and the priest will require you to agree to certain terms regarding the Faith of your spouse and any future children.