You have a bit of a problem because whichever you choose may not meet with the approval of whoever reads your statement! Dashes seem to be used more now than they were; I know I use them more than I used to On balance I would say the second looks fine, while the first looks a fraction awkward, but only a fraction. Why not avoid the problem and make two sentences, or, even better, use a semi-colon: I also have a desire to study the classics, such as Shakespeare, Chaucer, Fitzgerald and Hemingway; I believe knowledge of the English language and literature is a generally attractive and advantageous quality both professionally and socially Hint: try to avoid the word "desire" as it has amorous overtones.
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