Okay kiddo, let me try to explain this to you in a way that you can understand. The Halltown Colored Free School was a special school that was set up a long time ago.
Now, you know how you go to school to learn new things and get an education. Well, back then, some people weren't allowed to go to the same schools as other people because of the color of their skin. This was very unfair and made it hard for them to learn and get good jobs later on in life.
So, some kind-hearted people decided to set up a school just for these people. They called it the "Halltown Colored Free School". It was a place where children who were not allowed to go to other schools could come and learn.
This school was probably very different from the schools you go to. It might not have had a fancy building or toys to play with, but the teachers there were very special. They cared about the children and wanted to give them the best education they could.
The Halltown Colored Free School helped many children who might have otherwise missed out on an education. Eventually, the laws changed and everyone was allowed to go to the same schools, so the special school was no longer needed. But, it will always be remembered as a place where people cared enough to make sure that every child had a chance to learn.