The place of this 'qui'

[Thinkpad]

Hi!

I'm reading this sentence.

Mais un fantasme de traduction parfaite prend la relevé de ce banal rêve qui serait l'original redoublé.

I feel that "qui serait l'original redoublé" should modify "fantasme" rather than "rêve."

My question is, in principle, how to tell which one is modified. Can we tell it from the grammatical point of view alone without taking into account the context?

Thank you very much :)

[Chantal Savignat]

I would rather say "this French text is not a good model to learn French".

[Thinkpad]

Thank you very much! I've learned a lot. All responses are very helpful :)