Final answer:
The complete subject of the sentence is 'Harley'.
Step-by-step explanation:
The complete subject of the sentence is Harley.
The subject is the noun or pronoun that the sentence is about. In this sentence, the simple subject is Harley because it is the main noun that the sentence focuses on. The other parts of the sentence, such as led the pack and when she ran the 3,000 meter run provide additional information but are not part of the complete subject.
Learn more about Subject of a sentence