Justaguy, we can offer you general advice, and you may have noticed we like to discuss/argue matters to death at times here (which is a good thing i think), but with regards the specifics of your tree it really is impossible without being there to properly make an assessment.
From the pic, the tree is slightly buried in addition to having a very significant structural defect in both stems. Being buried is NOT good. It could be possible to bolt the two stems together, with perhaps a dynamic cabling system above, but there are a great many contributing factors to take into consideration before going down that track...potential targets being the main one!
I would be searching you local area for a Certified Arborist at the very least, check their credentials check how much experience with managing such trees they have...references, etc...
You could try here
Trees Are Good - Find a Tree Care Service
put in your location details and see who comes up.