Race Comment Explainer

Original comment with matches highlighted:

towards rear, jumped right 11th, ridden to go prominent 16th, ridden before 2 out, soon

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.
Towards rear	Running near the back of the field.
Weakened	The horse lost speed and dropped back through the field.
Headway	The horse was moving up through the field.

Summary

The jockey started urging the horse aggressively before the second-last obstacle to try and get it back into contention.
Running near the back of the field.
The horse lost speed and dropped back through the field.
The horse was moving up through the field.