Original sentence: He claims that even Lardner's screenplay was used only as a springboard.However the screenplay itself reveals that while there is some ad-libbing in the film, and although Altman moved major sequences around, most sequences are in the screenplay.The main deviation from the script is trimming much of the dialogue
Edited sentence: A reading of the screenplay, however, reveals the "springboard" claim to be nonsense.He adds that even Lardner's screenplay was used only as a springboard.The main job was in trimming dialogue, not coming up with Something Better.There is actually a minimum of ad-libbing in the film, and while Altman moved major sequences around like a Rubik's Cube, the sequences are in the screenplay