Complex sentence: An old tengu who was a longtime teacher of the Shimogamo brothers; in return, the brothers check up on him from time to time and take care of him like family, cleaning up his messy apartment and bringing him supplies and liquor.
Split into simpler sentences: An old tengu who was a longtime teacher of the Shimogamo brothers. The brothers check up on him from time to time and take care of him, cleaning up his messy apartment and bringing him supplies and liquor.