Thank you very much for your response, suggestions and time. I pruned the tree a lot, and have been giving it extra waterings. Hopefully that will be enough to save it, thank you again.
Discussion
No worries, hope you can save the tree.
Btw looking at the picture I’m getting a whacky idea 😬
See if you can find a branch that can fit between the spilt, like a pointy wedge, stick that branch in the split, just like tree grafting and then tape it nicely.