Okay kiddo, this is about a collection of art that belonged to a man named Cornelius Gurlitt. He was a man who loved art and had many paintings and other works of art in his house in Germany. But there's a bit of a problem with how he got some of these artworks.
You know how sometimes you find something on the ground that doesn't belong to you, like a toy or a ball? And you know that it belongs to someone else, so you try to return it to them? Well, it's kind of like that, but with art.
Some of the artworks in Gurlitt's collection were taken from other people during a time when Germany was at war, and it was a very bad time for many people. The people who had their art taken from them didn't want to sell it or give it away. The people who took the art didn't have the right to take it. So some of the art in Gurlitt's collection was taken in a way that wasn't very nice or fair.
Now that Gurlitt has passed away, the people who rightfully owned the art want it back. They're trying to figure out who the art belonged to before it was taken, and they're trying to return it to the families of those people. It's a bit of a complicated process, but the important thing is that the art is going back to where it belongs.
In the meantime, art experts are looking at the pieces in the collection to learn more about them and to make sure the art isn't damaged. It's a very interesting thing to study, and it's also an important lesson about why it's not okay to take things that don't belong to you.