A Complete sentence must follow these 3 rules:
Clauses: is a part or piece of a sentence. It must contain a subject and a Verb
Sentence can be made of one or more clauses, these can be dependent and independent
dependent: A Clause that cannot stand alone as a sentence. S+ V
Very much not complete in meaning, it will read like something is missing or to be added to it to make it complete.
Independent: A clause that can stand alone as a sentence. It is formed with clause connector + S+V
Connect independent clauses
FANBOYS