Okay, so imagine you have a secret club with your friends, and you promise to never tell anyone outside the club about what you do or who is in the club. This promise is very important and you have to keep it.
Now, let's say one of your friends tells someone outside the club about what you do and who is in the club. This is really bad because you all promised to keep it a secret. It's like breaking a promise, and that's not okay. This is called treason.
Compounding treason is like making it even worse. It's when you know that your friend has told someone outside the club, but instead of making things right, you help your friend keep the secret and don't tell anyone that they broke the promise. This is like pretending that everything is okay when it's not, and it makes things much worse.
In real life, compounding treason is when someone knows about someone committing treason against their country, but they don't report it or try to stop it. They keep the secret and let the person continue doing the bad thing that goes against the law and the safety of their country. This can be very dangerous and could cause harm to many people.