Original sentence: A Christian  is a person who adheres to Christianity, a monotheistic religion based on the life and teachings of Jesus of Nazareth, who Christians believe was the Son of God and had been prophesied in the Old Testament/Hebrew Bible
Edited sentence: A Christian  is a person who adheres to Christianity, a monotheistic religion centered on the life and teachings of the Son of God Jesus of Nazareth and claimed by Christians to have been prophesied in the Old Testament/Hebrew Bible