What is the {human} for {distributor} of {The Birth of a Nation}
Who is the wholesaler of The Birth of a Nation?
Who is the distributor of The Birth of a Nation?
SELECT DISTINCT ?z WHERE { resource:The_Birth_of_a_Nation property:distributed_by ?z . ?z rdf:type ontology:human }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q220394> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P750> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q5> } 
 select distinct ?obj where { wd:Q220394 wdt:P750 ?obj . ?obj wdt:P31 wd:Q5 } 
D. W. Griffith