Simplify the following text for a Grade 7 native English-speaking person.
Original: Before the first gospel was written ( Mark , c 65-70 ) , Paul the Apostle used the term gospel when he reminded the people of the church at Corinth `` of the gospel I preached to you '' ( 1 Corinthians 15.1 ) .
Simplified: These books are the first part of the New Testament of the Bible , and are put in a group of this order : the Gospel of Matthew , the Gospel of Mark , the Gospel of Luke and the Gospel of John . The gospel is mostly about the Death and Resurrection of Jesus .