Answer:
- Sentence.
Explanation:
A sentence is described as the group of words offering a complete thought while a run-on sentence is described as a sentence that incorrectly joins two or more independent clauses without any punctuation marks or conjunction.
As per the question, the given group of words exemplify a sentence(complex sentence) that offers a complete thought. It consists appropriately of a subordinate clause 'Although I was in last place' along with the principle clause 'I ran through the finish line as if I won the race' joined with adequate punctuation marks (comma) and subordinating conjunction 'although'. Thus, it would be categorized as a 'sentence'.
