Race Comment Explainer

Original comment with matches highlighted:

tracked leaders, went 2nd 5th, e 3 out, h 8th, st, kept on 3 out, held last,

Matched phrases & meanings

Phrase	Meaning
Tracked leader	Followed closely behind the leaders.
ridden before	The jockey started urging the horse aggressively before the second-last obstacle to try and get it back into contention.
not fluent	The horse jumped the tenth fence/hurdle poorly or awkwardly
Kept on	The horse maintained its speed well to the finish.

Summary

Followed closely behind the leaders.
The jockey started urging the horse aggressively before the second-last obstacle to try and get it back into contention.
The horse jumped the tenth fence/hurdle poorly or awkwardly
The horse maintained its speed well to the finish.