In order to answer this question, you must know what compound, complex, and compound-complex sentences are. A compound sentence is one that is created by joining two independent clauses (complete sentences) with a conjunction such as "and" or "but." A complex sentence contains one independent clause and one or more dependent clauses (phrases). A compound-complex sentence, as you might expect, contains both, at least two independent clauses and at least one dependent clause. Looking at the sentence in question, we see two independent clauses; "Sometimes the air that is rushing in begins to rotate" is a complete sentence, and "a tornado is formed" is also a complete sentence. There are no dependent clauses, but both of these independent clauses are joined by a conjunction (and). Thus, this is an example of a compound sentence.
Answer: a literal meaning of the word. connotation. an association (emotional or otherwise) which the word evokes. For example, both "woman" and "chick" have the denotation "adult female" in North American society, but "chick" has somewhat negative connotations, while "woman" is neutral.
