“We thought it was too huge a story not to maximise as a rich project that the children could learn from.” (The Guardian.)
Is too huge a story not to maximise as a rich project that the children could learn from a noun phrase functioning as a complement within the complement of the verb "thought", i.e., within "it was too huge a story..." ?
Is that the children could learn from a relative and content clause functioning as a complement of the noun phrase "a rich project"?
Correct. The complement of 'thought' is (that) it was too huge ... could learn from.
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Correct.
The complement of 'thought' is
(that) it was too huge ... could learn from.
Within that complement you have the noun phrase
too huge a story ... could learn from.
And there is also a relative clause that modifies (not complements) a rich project, i.e., that the children could learn from.
CJ