Okay kiddo, so the Alchon Huns were a group of people who lived a long time ago in a place called Central Asia. They were a group of nomads, which means they didn't have a permanent home and moved around a lot with their animals.
The Alchon Huns were really good at riding horses and fighting in battles. They were so good at it that they became very powerful and conquered a lot of land around them.
Eventually, they ended up in a place called India and ruled there for a while. They even left behind some cool things like sculptures and coins that we can still see today!
But then, other powerful groups of people came along and the Alchon Huns weren't as strong anymore. They eventually disappeared and we don't know much about what happened to them after that.
So basically, the Alchon Huns were a group of nomads who were really good at riding horses and fighting, and they ruled over India for a while before disappearing.