Complex sentence: Yoriki were samurai, they managed patrols and guard units composed of lower ranking police officials, yoriki being of a higher class were able to ride a horse while performing their duties and were trusted to carry out assignments of high importance.
Split into simpler sentences: Yoriki were samurai--they managed patrols and guard units composed of lower ranking police officials. Yoriki, being of a higher class, were able to ride a horse while performing their duties and were trusted to carry out assignments of high importance.