Some people may prefer to try to repair the damage by supporting the broken branches so that they may form a graft connection at the point of the injury. This may be successful if done immediately, but the chances of success rapidly decline over time. If you choose to attempt repair grafting, be careful that you do not do more harm than good. I have seen trees with ropes and chains around them as an attempt to hold a splitting trunk or to hold up a broken branch. Such treatment can girdle the tree and damage more than the broken branch.
Some people use a large bolt placed through the branch and the trunk.
This requires drilling a hole in the undamaged part of the tree and, if successful, results in steel being enclosed in the tree, creating a hazard many years in the future when someone with a chainsaw may be cutting the tree. At that time it may not be known that there is steel in the tree and the chainsaw operator may be injured. Proper pruning techniques are shown in many gardening magazines and books. Be sure your source of information is recent since pruning techniques have changed in the last couple of decades. If the bark has been torn down the trunk, it will be necessary to clean up the ripped bark, but again it is important to do less damage than the original injury to the tree.