"Not race" isn't adjectival. " (An appositive is a noun phrase that renames another noun: Barack Obama, the President of the United States of America. ") The "not" can only modify "moulding" since the sense is that "race did not mould the ...
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AnonymousI thought it was the indirect object of the whole sentence.Only ditransitive verbs (give, send, etc.) take indirect objects. Mould is not in that list.