Race Comment Explainer

Original comment with matches highlighted:

mid-division, chased leaders after 3 out, ird after las 2 out, took third after last,

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.
Mid-division	Running in the middle of the pack.
Kept on	The horse maintained its speed well to the finish.

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.
Running in the middle of the pack.
The horse maintained its speed well to the finish.