The sentence would be a compound sentence, I believe.
Answer:
That's true, because if it is unclassified, think about it, is that document really existant or important if it went unclassified? Or is it just lost?
If we are referring to academic vocabulary, we mean to say the words or group of words that are used in the academic dialogue. These words are not common and are not frequently encountered in daily conversations. We can change the word awful to dreadful.
