I don't see that the sentence is correctly structured. It seems that "is" is intended to agree with "production", but it doesn't quite work. The following would work (at least in terms of sentence structure; though I couldn't say for sure that it is semantically what the author is trying to say): The production of meaning, and of symbols and their material expression, is complex.
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The production of meaning, and of symbols and their material expression, is complex.I agree your correction, now the sentence seems simple to me.
janewantslearnSo I can't rewrite the sentence as "The production of meaning, and the production of symbols and their material expression are complex", right? (I mean only from sentence structure, regardless the meaning,)The production of X and the production of Y are ...
The production of X and the production of Y are ...
The production of X and (of) Y is ...I get it now. Thank you very much!