Okay, so a long time ago, some people who work for the government of the United States of America were living and working in a place called Tehran, which is in a country called Iran. But then some other people who did not like the United States came and took over the place where the first group of people were living and working, and they did not want them to leave.
The United States government wanted their people to come back home, but the people who took over the place where they were staying said no, they couldn't leave. So the United States asked other countries to help them get their people back, and they put some rules in place to try to make the other country let their people go.
But the people who took over the place where the Americans were staying said that the rules were not fair, and that they should not have to follow them. So they went to a special group of people who are very important and make decisions about law and justice, called the International Court of Justice.
The court listened to what both sides had to say, and looked at all the rules and laws about what countries can and cannot do. And then they made a decision. They said that the people who took over the place where the Americans were living and working were not following the rules, and they needed to let the Americans go back to the United States.
So in the end, the Americans were allowed to come back home, and the people who took over the place where they were staying had to follow the rules that the United States government had put in place.