Race Comment Explainer

Original comment with matches highlighted:

mid-division, ched le 6th, went 2nd and switched left 3 out, led last, won going away,

Matched phrases & meanings

Phrase	Meaning
Won going away	This means the horse was the strongest finisher and, if the race had been longer, the margin of victory would have continued to increase.
Switched left	Moved to find a clear run or better ground.
Mid-division	Running in the middle of the pack.
Headway	The horse was moving up through the field.
readily	The horse won easily, without having to be pushed to its absolute limit, suggesting it had more to give.

Summary

This means the horse was the strongest finisher and, if the race had been longer, the margin of victory would have continued to increase.
Moved to find a clear run or better ground.
Running in the middle of the pack.
The horse was moving up through the field.
The horse won easily, without having to be pushed to its absolute limit, suggesting it had more to give.