what is the {point in time} for {Leopold Stokowski} has {award received} as {Grammy Trustees Award} ?
In what year was Leopold Stokowski awarded the Grammy Trustees?
When did Leopold Stokowski win the Grammy Trustees Award?
SELECT ?m WHERE { ?c property:award_received resource:Grammy_Trustees_Award . resource:Leopold_Stokowski property:award_received ?c . ?c property:point_in_time ?m }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q297562> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P166> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q5593916> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q297562 p:P166 ?s . ?s ps:P166 wd:Q5593916 . ?s pq:P585 ?value}