No one but Marella was in the car when the accident occurred. No changes need to be made. It must have a subject and a predicate. An example of a simple complete sentence is sleeps. She is the subject sleeps is the predicate. In this instance the complete predicate is the verb sleeps.
According to grammar a complete sentence is one that contains a subject or noun that performs the action a main action or verb and in some cases other words that work as object or complement that explain the verb or the agents affected by it. Additionally to this for a sentence to be complete it needs to express a complete idea which means it does not require more words or sentences to stand and it needs to be correctly punctuated.
In the case of the sentence No one but Marella was in the car when the accident occurred this sentence has a subject no one but Marella a verb was and even a complement that explains the verb in the car when the accident occurred also this sentence expresses a complete idea and is correctly punctuated. Considering this it can be concluded this sentence is already complete and therefore no changes need to be made to make it a complete sentence.
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