what is the {end time} for {Ernest Shackleton} has {record held} as {Farthest South} ?
When did Ernest Shackleton's record for traveling farthest Soutn get broken?
Until when did Ernest Shackleton hold the record for having traveled the farthest South?
SELECT ?k WHERE { ?k property:end_time ?k . ?k property:record_held resource:Farthest_South . resource:Ernest_Shackleton property:record_held ?k }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q957543> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1000> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q2342357> .
?statement <http://www.wikidata.org/entity/P582> ?value. 
} 

SELECT ?value WHERE { wd:Q957543 p:P1000 ?s . ?s ps:P1000 wd:Q2342357 . ?s pq:P582 ?value}