Question: Which is {point in time} {educated at} of {{Leonid Kantorovich} has {academic degree} as {professor}}
SPARQL (Wikidata): SELECT ?value1 ?value2 WHERE { wd:Q107441 p:P512 ?s . ?s ps:P512 wd:Q121594 . ?s pq:P585 ?value1 . ?s pq:P69 ?value2 }