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 AndersonThe mission of the playwright ... is to look in his heart and write, to write whatever concerns him at the moment; to write with passion and conviction. Of course the measure of the man will be the measure of the play.
Robert AndersonA lot of young writers wait for inspiration. The inspiration only hits you at the desk.
Robert Anderson