(g) Proof of Service. The person effecting service shall make proof thereof to the clerk within the time during which the person served must respond to the summons. Failure to make proof of service, however, shall not affect the validity of service.
In writing, it is important to recognize the different types of clauses, or groups of related words. An independent clause is a simple sentence. It contains a subject, verb, and a complete thought. It can stand alone.
This last type of compound sentence is the one we will concentrate on for comma use. A compound sentence must have two independent clauses  not just two verbs, two nouns, or two groups of words that are not independent clauses. Look at this example. In the above example, two verb groups are being joined by and.