I think it read just fine. It certainly got across your experience and what you want to do.
Just had some awfully run on sentences, is all.
I love a good comma, you can add a comma, and another, and pretty much just keep talking, and talking, and talking. ;~)
We are limited in what we know in that the phone number on the ad led to the secretary of a construction company the trainer also owns, and she didn't know a lot... didn't know if there are 10 or 100 horses. She seemed to think they wanted grooms, and people that could fix fence. Least that's what she knew enough to mention.