what is the {end time} for {Jefferson Davis} has {spouse} as {Varina Davis} ?
What day did Jefferson and Varina Davis break up?
When did the marriage of Jefferson and Varina Davis end?
SELECT ?u WHERE { ?v property:end_time ?u . resource:Jefferson_Davis property:spouse ?v . ?v property:spouse resource:Varina_Davis }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q162269> .
?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> <http://wikidata.dbpedia.org/resource/Q457993> .
?statement <http://www.wikidata.org/entity/P582> ?value. 
} 

SELECT ?value WHERE { wd:Q162269 p:P26 ?s . ?s ps:P26 wd:Q457993 . ?s pq:P582 ?value}