The Restoration Movement was born during the Second Great Awakening in the early 19th century when various members from different Christian denominations thought the Christian Church had fallen away entirely and needed to be restored to it’s fullness. They hoped to establish a church based solely on the Bible—with their core belief in Jesus as the only model and the Bible as the only holy book.
They rejected rules and practices that did not come explicitly from the Bible and claimed they caused unnecessary divisions in the church. The ultimate goal was for all denominational boundaries to dissolve and become united as one church under God’s rule alone.
This movement consisted of a number of groups that, ironically, ended up forming all of their own sects such as the Churches of Christ, the Latter-Day Saints (Mormons), and the Independent Christian Churches.
Seventh-Day Adventism came about at a time and in a region where this mindset was prevalent which impacted the movements founding. While they do not formally go back to the Restorationist Movement, the ideology of that movement does. The SDA Church teaches that the true Church fell away after the time of the Apostles and that God raised them up as a last day’s movement to restore the Church and the Gospel to it’s fullness. They call this the “Everlasting Gospel”, borrowed from Revelation 14:6.