Okay, imagine you have two groups of friends. One group likes to play football and the other group likes to play basketball. But sometimes, there aren't enough people to play the game they want to play.
So, they thought, "Why don't we all become friends and merge into one big group? Then we can play both football and basketball together and we'll always have enough players!"
The same thing can happen in politics. Sometimes, two different political parties or organizations may decide they want to work together because they have similar goals or ideas, and it would be easier to achieve those goals by joining forces.
When these political groups combine, it's called a merger. They become one big organization with a new name and logo that represents both groups, but they still have their own ideas and beliefs.
Just like how your friends still like to play football or basketball, the political parties will still have their own priorities and ideas, but they'll try to work together to accomplish their common goals.