Complex sentence: At the Kentucky Derby, for example, a jockey cannot exeed 126 pounds, including his equipment, so most jockeys are between 4'10 and 5' 6.
Split into simpler sentences: At the Kentucky Derby, for example, a jockey cannot exeed 126 pounds, including his equipment. There is no specific height requirement, but due to the weight restrictions, most jockeys stand between 4'10 "and 5' 6".