Of course the two clauses have absolutely nothing to do with each other logically. The author is struggling to connect diverse materials and obviously lacks experience. Both are grammatical in my opinion, but hardly interchangeable.
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Avangi
It boils down to whether we should say "Shakespeare is the author of Macbeth," or "Shakespeare was the author of Macbeth."
English 1b3Are both correct/interchangeable?I find both of them correct. Whether you consider them interchangeable depends on how picky you want to be.