what is the {start time} for {United Nations Educational, Scientific and Cultural Organization} has {chairperson} as {Julian Huxley} ?
When did Julian Huxley Chari the United Nations Educational, Scientific, and Cultural Organization?
When was julian Huxley as chairperson of the United Nations Educational, Scientific and Cultural Organization?
SELECT ?m WHERE { resource:UNESCO property:chairperson ?j . ?j property:start_time ?m . ?j property:chairperson resource:Julian_Huxley }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q7809> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P488> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q243419> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q7809 p:P488 ?s . ?s ps:P488 wd:Q243419 . ?s pq:P580 ?value}