Okay kiddo, so you know how it's not very nice to peek at other people's stuff without their permission? The National Security Agency (NSA) in the United States was peeking at other countries' stuff, including Germany's. This made the German government very upset because they thought it was not fair and respected other country's privacy.
Now, the German government created a group of people called a parliamentary committee to investigate what happened. They wanted to understand more about the spying and how it affected Germany. The committee talked to lots of people, including government workers and the people who were being spied on, to try to understand what happened and how they can stop it from happening again in the future.
Think of it like this - the committee is like a team of detectives trying to solve a mystery about why and how the spying happened. And once they figure it out, they will tell everyone what they found out so that everyone can learn from it and make sure it doesn't happen again.