Race Comment Explainer

Original comment with matches highlighted:

mid-division, ridden before 3 out, un in to challenge before last, strongly to lead run in

Matched phrases & meanings

Phrase	Meaning
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.
Headway	The horse was moving up through the field.
Ran on	The horse maintained or increased its speed in the final stages.

Summary

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 was moving up through the field.
The horse maintained or increased its speed in the final stages.