What is {spouse} of {Wallis Simpson} that is {start time} is {1928-1-1} ?
Which person was the spouse Wallis Simpson since 1928?
Who did Wallis Simpson marry in 1928?
SELECT ?y WHERE { ?e property:start_time ?f . resource:Wallis_Simpson property:spouse ?e . ?e property:spouse ?y . FILTER ( CONTAINS ( YEAR ( ?f ) , '1928' ) ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q209417> .
?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> <1928-1-1>
} 

SELECT ?obj WHERE { wd:Q209417 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1928')) }