Okay, so a long time ago, when people first started practicing Christianity in England, there was just one big church organization. This was called the Church of England, and it was led by one man who was called the Archbishop of Canterbury.
But over time, as more and more people in England became Christian, it became harder for the Archbishop to take care of everyone in the country by himself. So he decided to break up the Church of England into smaller groups, which he called dioceses.
Each diocese had its own leader, who was called a bishop. The bishop was in charge of taking care of all the people who lived in their diocese and making sure they followed the rules of the Church.
At first, there were only a few dioceses in England, but as the country grew and changed, more and more dioceses were created. Today, there are 42 dioceses in the Church of England, and they each have their own bishop who looks after the people in their area.
So now, instead of just one big Church of England, there are lots of smaller dioceses, each with their own special place and leader. This helps make sure that everyone who wants to be part of the Church of England can find a community near them and get the help they need.