The first thing is to be kind, empathetic, and understanding when someone isn't as good at you as something. This happens to everyone, and no matter how smart someone is, there are things they are particularly bad at as well. Keeping in mind the things you struggle with, can help with empathy and humility, and help you figure out what tasks to try to delegate to others.

The smarter someone is, the more they will be used to working alongside people less intelligent, and still work together effectively, and not make others feel bad about it. Particularly smart people can find it shocking when someone else belittles or ridicules another for not understanding something, because they are used to always understanding more than everyone around them their whole lives, but usually keeping it to themselves to not make others angry or feel bad about it. They're not going to be angry or upset when other people struggle or don't understand as well as them, as it is the norm, and something they've almost never not experienced.

Lastly, in a leadership position, look to figure out where peoples strengths do lie, and give them that part of the project. If they have no strengths or abilities consistent with the job at hand, that might not be possible, but seems like a major failure of the hiring process in the first place, and shouldn't be possible- it isn't the fault of the person that was hired inappropriately.