That's not really correct. *Anyone* who has divorced and NOT remarried may still receive communion, regardless of the grounds for the divorce. The issue that impedes receiving communion isn't the divorce but the *remarriage.* That constitutes an ongoing state of adultery (Matt. 5:31-32, Matt. 10:09, Mark 10: 11-12, Luke 16:18), or an ongoing state of mortal sin, and THAT is why communion cannot be received.
If the original spouse of each of the "remarried" peple dies, then it is possible for the couple to have their maried sanated in the Church, and from that time on, the marriage will be valid and they can return to the Sacraments. That is the only way for them to do so short of disolving their putative marriage.
Well, actually, there is one additional exception. The Church recognizes that, in some of these second marriages, there are young children involved who are products of that marriage. It may not be financially possible to dissolve the family because of the children's welfare. In this case, IF a couple promises to refrain from relations, and live as "brother and sister," they can approach their pastor with the situation and return to the Sacraments, provided that they can ALSO do this without scandalizing the faithful in their parish.
Er..typo! "Matt. 10:09" should be Matt. 19:09! Hitting a key one to the right of the one I wanted makes a whole LOT of difference! ;-)