What is {end time} and {start time} of {{Nigel Farage} has {employer} as {Refco}}
Nigel Farage worked at refco. When did he start and when did he leave?
When did Nigel Farage started to work at Refco and when did he leave?
SELECT ?e ?b WHERE { ?y property:start_time ?b . ?y property:end_time ?e . ?y property:employer resource:Refco . resource:Nigel_Farage property:employer ?y }
select distinct ?value1 ?value2 where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q318471> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P108> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q2136640>. ?statement <http://www.wikidata.org/entity/P580> ?value1 . ?statement <http://www.wikidata.org/entity/P2842> ?value2 } 
SELECT ?value1 ?value2 WHERE { wd:Q318471 p:P108 ?s . ?s ps:P108 wd:Q2136640 . ?s pq:P582 ?value1 . ?s pq:P580 ?value2 }