It will survive-African Sumacs are pretty much indestructible here in Arizona. Arborists actually consider them invasive here since they are very hearty and reseed themselves everywhere. It is a large wound area but I do believe it will heal. Now as for the tree having balance and a nice shape, that will be hard to create with this damage. Good luck!

Thank you for the feedback. I'm glad to hear that it is strong enough to survive. Unfortunately, I cannot replace it right now, so it will have to remain unbalanced and not so nice to look at. Of course the limb that fell had to be facing into the yard.

I think you should remove it and plant something native to your region. Bella...the word is hardy not hearty! Joe... Bark is the trees skin protecting it's insides from being attacked or damaged,you should seal the open area so insects/disease cannot enter the raw wood and destroy whole tree. Google different types of sealants that can be painted on,or maybe wrapped. With many fast growing invasive trees if you trim branches back on the healthy side it will most likely send new starts off of the trunk. If the tree loses it's leaves(deciduous) trimming is best done when it is dormant.It is best to cut them back relatively far so when it comes out of it's dormant stage it will not be so heavy on one side and possibly break again, or even tip over becoming uprooted. When new shoots begin to grow clean/clear off ones you do not want to continue growing,clipping them off all the way flush with bark. Leaving one or two to grow on damaged side just below damaged area.Continue watching for any new ones you do not want to become a large limb removing them as soon as they start to sprout,also continue trimming side without damage. This constant clipping/pruning will help tree to eventually level/balance out. Hope I explained it OK. I hope your tree lives if not maybe then replace it with something native to area, Good luck