what is the {point in time} for {Samuel Eliot Morison} has {award received} as {Pulitzer Prize for Biography or Autobiography} ?
In which year did Samuel Eliot Morison receive the Pulitzer Prize for Biography and Autobiography?
When  did Samuel Eliot Morison receive his Pulitzer Prise for Biography and Autobiography?
SELECT ?z WHERE { ?u property:award_received resource:Pulitzer_Prize_for_Biography_or_Autobiography . resource:Samuel_Eliot_Morison property:award_received ?u . ?u property:point_in_time ?z }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q982883> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P166> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q285117> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q982883 p:P166 ?s . ?s ps:P166 wd:Q285117 . ?s pq:P585 ?value}