What is {spouse} of {Guglielmo Marconi} and {start time}
When was married to Guglielmo Marconi and his wife?
When did Guglielmo Marconi and his wife get married?
SELECT ?u ?j WHERE { resource:Guglielmo_Marconi property:spouse ?y . ?y property:spouse ?j . ?y property:start_time ?u . }
select distinct ?dataprop1 ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q36488> . ?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> ?obj . ?statement <http://www.wikidata.org/entity/P580> ?dataprop1 . } 
SELECT ?value1 ?obj WHERE { wd:Q36488 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?value1 . }