what is the {has cause} for {Van Morrison} has {spouse} as {Michelle Rocca} ?
Why was Michelle Rocca Van Morrison's wife?
Why Van Morrison has his spouse Michelle Rocca?
SELECT ?y WHERE { ?b property:has_cause ?y . resource:Van_Morrison property:spouse ?b . ?b property:spouse resource:Michelle_Rocca }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q272203> .
?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/Q372148> .
?statement <http://www.wikidata.org/entity/P828> ?value. 
} 

SELECT ?value WHERE { wd:Q272203 p:P26 ?s . ?s ps:P26 wd:Q372148 . ?s pq:P828 ?value}