If you mean a run on sentence it is a sentence that keeps going without a comma.
Ran is the verb in that sentence>
You ran to school.
It takes the place of a noun. In the sentence "The cat ran", the pronoun "it" can be used to replace "the cat" to make the sentence "It ran."
Yes, "She ran." is a complete sentence because it has a subject and a verb.
Sara ran towards the house.
ran tired
That looks like a complete sentence to me.
You need a context to determine whether "ran" is transitive or intransitive. It is intransitive in the sentence, "She ran all the way home." It is transitive in the sentence, "He ran the business after his father died."
The adverb in that sentence is downstairs. It's an adverb of place and tells where you ran.
The compound verb in the sentence is "sniffed" and "ran".
The complete subject in the sentence is "Javier".
The correct way to say the sentence is, "Mr. Jones and he ran the fair."