<prompt> Translate the following text to SwahiliOne must turn to the informative catalog, by guest curator Richard Kendall, to learn something of this unsavory episode in Degas life, a further lesson that avant-garde art and retrograde politics often coexist.  <response>: Mtu lazima kugeuka kwa orodha ya habari, na mgeni curator Richard Kendall, kujifunza kitu cha hii tukio unpleasant katika maisha ya Degas, somo zaidi kwamba avant-garde sanaa na siasa retrograde mara nyingi kuishi pamoja. 