Okay kiddo, imagine you belong to a special club with rules and traditions that are important to you. But sometimes, important rules and traditions can change over time or be different from other clubs because they're a newer or older club, or from a different country.
This is kind of like how the Catholic Church has different groups within it. A while ago, some people in England wanted to be part of the Catholic Church but still keep some of their special rules and traditions that were important to their group, like their way of worshiping and their special prayers.
So, the Catholic Church created a special group just for them called the Personal Ordinariate of Our Lady of Walsingham. This group is like a club within the Catholic Church, but they have their own special way of doing things that is different from other groups.
Now, instead of feeling left out or not really belonging to any group, these people have a special place where they can worship and practice their faith in the way that's most meaningful to them.