Answer:
The Olympic flame, one of the most visible symbols of modern games, is a tradition of Ancient Greece.
or
The Olympic flame, a tradition of Ancient Greece, is one of the most visible symbols of modern games.
Step-by-step explanation:
An appositive refers to a noun or noun phrase, usually between commas, which defines, identifies or describes the noun it follows. As a result, both possible appositives between commas illustrate the noun The Olympic flame. Therefore, both establish it as either a symbol of the modern games or a tradition of Ancient Greece.