Final answer:
The correct revision of the sentence is: 'My friend is a great athlete; he won the game last night.'
Step-by-step explanation:
The correct sentence revision is: My friend is a great athlete; he won the game last night. This sentence uses a semicolon to separate the two independent clauses and maintain the logical connection between them. It ensures that both ideas are grammatically correct and that the sentence is properly punctuated.
Learn more about Revising a sentence for clarity and grammatical correctness