The phrase "The dog, the cat, the donkey, and the rooster sitting in the yard" is a sentence fragment. It does not form a complete sentence because it lacks a main verb and does not express a complete thought; it's simply a list of subjects with a prepositional phrase. To make it a complete sentence, you could say, "The dog, the cat, the donkey, and the rooster are sitting in the yard."
The dog, the cat, the donkey, and the rooster sitting in the yard
complete sentence a fragment run on sentence or comma splice
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