what is the {start time} for {Neil Simon} has {spouse} as {Marsha Mason} ?
When was the spouse of Marsha Mason, Neil Simon born?
When Neil Simon, the spouse of Marsha Mason, was born?
SELECT ?q WHERE { ?q property:start_time ?q . ?q property:spouse resource:Marsha_Mason . resource:Neil_Simon property:spouse ?q }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q315808> .
?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/Q235211> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q315808 p:P26 ?s . ?s ps:P26 wd:Q235211 . ?s pq:P580 ?value}