Okay buddy, let me try to explain this to you in simple terms! The Bohr-Sommerfeld quantization is a way of figuring out how electrons orbit around the nucleus of an atom. You know what an atom is, right? It's like a tiny little thing that makes up everything in the world.
So, inside of an atom, you have the nucleus in the middle which is made up of protons and neutrons, and then you have electrons that orbit around it like little planets. But here's the thing, these electrons can only orbit the nucleus at certain distances, sort of like they are on a ladder with rungs that they can jump up and down on.
The Bohr-Sommerfeld quantization was a way for scientists to figure out these specific distances when electrons can orbit around the nucleus. They used math to calculate where these rungs on the ladder were, and this helped us understand how atoms work and how they behave.
So, basically, the Bohr-Sommerfeld quantization helped us figure out how electrons move around the nucleus of an atom, and this helps us understand a lot about how things work in the world around us. Pretty cool, huh?