query: SELECT DISTINCT ?item ?itemLabel ?start ?end ?endcause ?endcauseLabel 
  WHERE
  {
    wd:Q714581 p:P286 ?st .
    ?st ps:P286 ?item .
    OPTIONAL { ?st pq:P580 ?start } 
    OPTIONAL { ?st pq:P582 ?end } 
    OPTIONAL { ?st pq:P1534 ?endcause } 
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }
  ORDER BY DESC(?start)