Okay kiddo, a peace commissioner is someone who is asked by the government to help keep the peace and prevent any fights or arguments from getting too out of hand. They might be called in to help when two people or groups are having a disagreement and they need someone to help them talk it out and find a solution.
The peace commissioner is like a grown-up mediator, kind of like the teacher who helps you and your classmates talk about a problem and come up with a solution. They are trained to be good listeners and to help people see each other's point of view.
Sometimes, a peace commissioner might even be asked to help with bigger problems, like when a whole community is having a conflict or when there is a crisis situation. It's their job to do their best to keep everyone safe and try to find a peaceful resolution.
So basically, a peace commissioner is like a superhero who helps keep the peace and make sure everyone is getting along nicely.