Garner Ted first created the Church of God, International from which he was ousted after a scandal involving a masseuse. He then formed the Intercontinental Church of God - all of this while maintaining the GTA Evangelistic Association. After his death his son, Mark Armstrong seems to be heading operations along with a few "faithfuls" from the CGI era.
The Trumpet is published by Gerald R Flurry, who heads the Philadelphia Church of God. Just another offshoot from the WCG, as we would term it. :-)
Hoping this answer helps clarify any misunderstandings you might have had about Armstrongism... ;-)