Okay kiddo, so there was a grown-up named Mongelli who did something that some other grown-ups thought was wrong. They brought him to something called a court to decide if he did something wrong or not.
Now, in this court, there were two sides: the people who said Mongelli did something wrong, and Mongelli himself, who said he didn't do anything wrong. The people who thought he did something wrong had to prove it to the judge.
They had some evidence like papers and emails to show that Mongelli did something wrong. And Mongelli had to explain why he didn't do anything wrong.
After both sides talked, the judge decided that Mongelli did indeed do something that was not allowed. So the judge told him that he had to pay some money to the people he did something wrong to.
That's what happened in the Mongelli case. Does that help explain it, kiddo?