what is the {start time} for {César Franck} has {country of citizenship} as {United Kingdom of the Netherlands} ?
Cesar Franck received his citizenship of the United Kingdom of the Netherlands in what year?
When did Cesar Franck become a citizen of the United Kingdom of the Netherlands?
SELECT ?j WHERE { ?c property:start_time ?j . ?c property:country_of_citizenship resource:United_Kingdom_of_the_Netherlands . resource:César_Franck property:country_of_citizenship ?c }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q50187> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P27> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q15864> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q50187 p:P27 ?s . ?s ps:P27 wd:Q15864 . ?s pq:P580 ?value}