What is {spouse} of {Katharine Cornell} that is {start time} is {1921-1-1} ?
In 1921-1-1, who was Katharine Cornell's spouse?
Who is the spouse of Katharine Cornell in 1921-1-1?
SELECT ?d WHERE { resource:Katharine_Cornell property:spouse ?o . ?o property:spouse ?d . FILTER ( CONTAINS ( YEAR ( ?s ) , '1921' ) ) . ?o property:start_time ?s }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q272086> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P26> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1921-1-1>
} 

SELECT ?obj WHERE { wd:Q272086 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1921')) }