Race Comment Explainer

Original comment with matches highlighted:

led until after 4th, chased leaders on inside, d and went le 3 out, and went left next

Matched phrases & meanings

Phrase	Meaning
Chased leaders	Running directly behind the horses in front of the field.
ridden before	The jockey started urging the horse aggressively before the second-last obstacle to try and get it back into contention.
Weakened	The horse lost speed and dropped back through the field.

Summary

Running directly behind the horses in front of the field.
The jockey started urging the horse aggressively before the second-last obstacle to try and get it back into contention.
The horse lost speed and dropped back through the field.