Okay kiddo, Republika Srpska is a piece of land located in a country called Bosnia and Herzegovina. It's like a big puzzle, where you have all these different pieces together, but sometimes they don't fit together perfectly.
A long time ago, there was a war in Bosnia and Herzegovina. People had disagreements about how the country should be run and who should be in charge. One group of people, who were mostly Serbian, wanted to have more control over their own land. So they formed their own area within Bosnia and Herzegovina called Republika Srpska.
Think of it like a club. The Serbian people wanted to be in their own club within the bigger club of Bosnia and Herzegovina. They wanted to be able to make their own rules and have more say in how things were done in their area.
But not everyone agreed with them. Some people thought that Bosnia and Herzegovina should stay as one big club, without any separate areas. They thought that everyone should work together and have equal say in how things were run.
Even today, there are still some disagreements about Republika Srpska. But everyone wants to find a way to work together peacefully, and make sure that everyone's voice is heard. It's like trying to solve a puzzle - it may be hard, but if everyone works together, they can make it happen.