Complex sentence: A good equitation rider is always in balance with the horse, maintains a correct position in every gait, movement, or over a fence, and possesses a commanding, but relaxed, presence, able to direct the horse with nearly invisible aids.
Split into simpler sentences: A good equitation rider is always in balance with the horse, maintains a correct position in every gait, movement, or over a fence, and possesses a commanding, but relaxed, presence. They are effective riders, able to direct the horse with nearly invisible aids.