Complex sentence: Although they do not appear in any episode, scenes from the "Jack Armstrong" test film were incorporated into the "Jonny Quest" closing credits: they are the scenes of Jack Armstrong and Billy Fairfield escaping from African Warriors by hovercraft.
Split into simpler sentences: Although they do not appear in any episode, scenes from the "Jack Armstrong" test film were incorporated into the "Jonny Quest" closing credits. They are the scenes of Jack Armstrong and Billy Fairfield escaping from African warriors by hovercraft.