The Disciples of Christ is a religious group that was started by a man named Alexander Campbell. He wanted to create a church that was based only on what the Bible says and not on other people's opinions.
The church believes in baptism and the Lord's Supper, and they also believe that everyone should have the freedom to interpret the Bible in their own way.
The Campbell Movement is a group of people who followed Alexander Campbell's teachings and helped to spread the beliefs of the Disciples of Christ.
So, imagine you have a really important book that tells you how to be a good person. Alexander Campbell thought that the Disciples of Christ should follow only what that book says and not what other people tell them. The people who liked this idea formed a group called the Campbell Movement, and they helped to tell other people about their beliefs.