This is how I analyze it: This is a simple linking verb structure with the linking verb "is" linking the subject with the predicate, which designates the same thing as the subject. ' " In the subject, "Part" is actually the subject itself, and "of the problem" and "in Plato's Meno" are adjectival prepositional phrases modifying "Part" and "problem," respectively. The group of words, "that Meno himself has too much 'culture' ", has a noun function and functions like a single noun.
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