Race Comment Explainer

Original comment with matches highlighted:

rear of mid-division best, ridden and iled off entering straight,

Matched phrases & meanings

Phrase	Meaning
Mid-division	Running in the middle of the pack.
tailed off	A definitive statement that the horse was finished and effectively out of the race
Weakened	The horse lost speed and dropped back through the field.
Rear	Running near the back of the field.

Summary

Running in the middle of the pack.
A definitive statement that the horse was finished and effectively out of the race
The horse lost speed and dropped back through the field.
Running near the back of the field.