What is {award received} of {W. D. Hamilton} that is {point in time} is {1991-0-0} ?
W.D. Hamilton won what in 1991?
What did W.D. Hamilton win in 1991?
SELECT ?c WHERE { ?g property:award_received ?c . resource:W._D._Hamilton property:award_received ?g . ?g property:point_in_time ?s . FILTER ( CONTAINS ( YEAR ( ?s ) , '1991' ) ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q15451> .
?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> ?obj .
?statement <http://www.wikidata.org/entity/P585> <1991-0-0>
} 

SELECT ?obj WHERE { wd:Q15451 p:P166 ?s . ?s ps:P166 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1991')) }