what is the {start time} for {Bertrand Russell} has {spouse} as {Patricia Helen Spence} ?
When did the marriage between Bertrand Russell and Patricia Helen Spence happen?
When did Bertrand Russell marry Patricia Helen Spence?
SELECT ?h WHERE { ?r property:start_time ?h . resource:Bertrand_Russell property:spouse ?r . ?r property:spouse resource:Patricia Russell, Countess Russell }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q33760> .
?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> <http://wikidata.dbpedia.org/resource/Q22920050> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q33760 p:P26 ?s . ?s ps:P26 wd:Q22920050 . ?s pq:P580 ?value}