Okay kiddo, so Commonwealth v. Matos is a fancy way of saying that there was a big legal case that happened in Massachusetts, where the Commonwealth is the name they give to the state.
Now, let me explain what happened in the case. There was a guy named Wilton Matos who was accused of stealing a car and breaking into a house. This is called a crime, and if someone does something like this, the police will arrest them and take them to court.
At the trial, the prosecutors (these are the people who try to prove that someone did something wrong) told the jury that Matos was guilty because there was DNA evidence found on the stolen car and evidence showing he broke into the house. But, Matos said that he didn't do it and that the evidence wasn't enough to prove he was guilty.
After a lot of discussion and debates in court, the judge said that there was enough evidence to say that Matos was guilty. So, Matos was found guilty and sentenced to a term in prison. This means he had to stay in prison as punishment for what he did.
This case is important because it shows how the justice system works in the United States. When someone is accused of a crime, they get a chance to defend themselves in court, and the lawyers and the judge will look at all the evidence to figure out if that person is guilty or not.
It's important to remember that if someone has been found guilty of a crime, it doesn't mean they are bad people. Everyone makes mistakes sometimes, but we must take responsibility for our actions, and sometimes that means serving time in prison to pay for what we did wrong.