Input (grade 13): The Olympic Games (- ta Olympia; - Olympiakoi Agones) were a series of athletic competitions held for representatives of various city-states of Ancient Greece held in honor of Zeus.
Output (grade 8): The Ancient Olympic Games were a series of athletic competitions held between the city-states of Ancient Greece. They used to be called the Olympic Games (; Olympiakoi Agones) until the modern day Olympic Games started.