One of the best known is the Western States Endurance Run, the world's oldest 100-mile trail run.
The most famous ultramarathon run in the United States is the Western States 100 Mile Race.
The most famous ultramarathon run in the United States is the Western States 100 Mile Race.
Make the sentence simpler: One of the best known is the Western States Endurance Run, the world's oldest 100-mile trail run. Output: