Answer: The sentence provided has a simple sentence structure.
Step-by-step explanation: A simple sentence is a sentence made up of only one clause; therefore, a simple sentence consists of only one subject and one predicate. This single clause is considered an independent clause because it expresses a complete idea. In the case of the sentence provided, there is only one subject and one verb ("are"); therefore, it has a simple sentence structure. The "and" found between "Roswell" and "Farmington" has only been used to add another item to the enumeration and not to connect this clause to another clause.