Complex sentence: Armstrongism is a term, usually considered derisive, for the teachings and doctrines of Herbert W. Armstrong while leader of the Worldwide Church of God (WCG), and is professed by him and his followers to be the restored true Gospel of the Bible.
Split into simpler sentences: Armstrongism is a term, usually considered derisive, for the teachings and doctrines of Herbert W. Armstrong while leader of the Worldwide Church of God (WCG). HIs teachings are professed by him and his followers to be the restored true Gospel of the Bible.