Complex sentence: The term "Armstrongite" is sometimes used to refer to those that follow Armstrongism, but is generally considered derogatory by those to whom it is applied, who prefer to be known as members of the "Church of God".
Split into simpler sentences: The term "Armstrongite" is sometimes used to refer to those that follow Armstrong's teachings. "Armstrongism" and "Armstrongite" are generally considered derogatory by those to whom it is applied, who prefer to be known as members of the "Church of God".