Final answer:
The correct sentence is option C: The Renaissance beat the Celtics in 1927 and the "Rens" went on to become the first professional team to win an integrated tournament championship in 1939.
Step-by-step explanation:
The correct sentence is option C: The Renaissance beat the Celtics in 1927 and the "Rens" went on to become the first professional team to win an integrated tournament championship in 1939. This option uses proper punctuation by including a comma before the coordinating conjunction "and" to separate the two independent clauses.