what is the {start time} for {Auschwitz concentration camp} has {instance of} as {Nazi concentration camp} ?
On what date was the Auschwitz concentration camp changed to the Nazi concentration camp?
When did the Auschwitz concentration camp become Nazi concentration camp?
SELECT ?e WHERE { resource:Auschwitz-Birkenau rdf:type ?w . ?w rdf:type ontology:Nazi_concentration_camp . ?w property:start_time ?e }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q7341> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P31> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q328468> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q7341 p:P31 ?s . ?s ps:P31 wd:Q328468 . ?s pq:P580 ?value}