Complex sentence: In "Destroy All Monsters", Baragon was supposed to attack Paris for the film, using his burrowing ability to smash the Arc de Triomphe from below, but the Baragon suit was unavailable, on loan for work on "Ultraman".
Split into simpler sentences: In "Destroy All Monsters", Baragon was supposed to attack Paris for the film, using its burrowing ability to smash the Arc de Triomphe from below. Unfortunately, the Baragon suit was unavailable due to the fact it was on loan for work on "Ultraman".