There's another way to edit the sentence, which is to add a comma before the second 'which.' The survivor is struggling toward 'some resolution,' not a specific resolution that the mind may never find. The final clause is an appended thought, not a conclusion of the previous clause: 'Death ends a life, but it does not end a relationship, which struggles on in the survivor's mind toward some resolution, which it may never find.'
Robert AndersonI shall await the first shot, and if you do not batter us to pieces, we shall be starved out in a few days.
Robert AndersonIn every marriage more than a week old, there are grounds for divorce. The trick is to find, and continue to find, grounds for marriage.
Robert AndersonA lot of young writers wait for inspiration. The inspiration only hits you at the desk.
Robert Anderson