Okay, so you know how there are different countries in the world, right? Well, Mongolia and Tibet are two places that are like countries, but they are not actually countries because they are part of another country called China.
Now, sometimes there are problems between different places that are part of the same country. That's where the Mongolian and Tibetan Affairs Commission comes in. Basically, it is a group of people whose job is to help make things better between the government of China and the people who live in Mongolia and Tibet.
They do lots of things to try to make people in those places happy and make things work better between them and the Chinese government. They might help with things like education, health care, and cultural events to help spread awareness of Mongolian and Tibetan cultures. They might also help with things like government policies and regulations that impact the people of Mongolia and Tibet.
So basically, the Mongolian and Tibetan Affairs Commission is a group of people who help make things better between the government of China and the people who live in Mongolia and Tibet.