It looks as if "complete" is just an error or typo for "completely". "lacking" is an adjective modifying "translation". " (the article "a" is necessary).
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park sang joonSo I was wondering if a subject and the verb 'be' can't be omitted together in the first complete clause, as in my example.Your example is an informal shortening. It is not a formally grammatically complete sentence. Such omissons can happen in informal speech and writing.