Complex sentence: Horner had even less respect for fellow Albertan Clark than he had for Stanfield, regarding him as a city slicker, and once giving him the ultimate rancher's insult by describing him as a "sheep herder".
Split into simpler sentences: Horner had even less respect for fellow Albertan Clark than he had for Stanfield, regarding him as a city slicker. Horner once paid Clark the ultimate rancher's insult by describing him as a "sheep herder".