Complex sentence: The Church of the Great God (CGG) is one of the Armstrongist Churches of God to form in the wake of the Worldwide Church of God's major doctrinal revisions of the 1980s and 1990s.
Split into simpler sentences: The Church of the Great God (CGG) is one of the Armstrongist Churches of God. It formed in the wake of the major shifts in doctrine by the Worldwide Church of God during the 1980s and 1990s.