Complex sentence: The designation of miniature horse is determined by the height of the animal, which, depending on the particular breed registry involved, is usually less than as measured at the last hairs of the mane, which are found at the withers.
Split into simpler sentences: The designation of miniature horse is determined by the height of the animal. Depending on the particular breed registry involved, is usually less than as measured at the last hairs of the mane, which are found at the withers.