Question: What work has been directed by Orson Welles and distributed by  RKO Pictures?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/director> <http://dbpedia.org/resource/Orson_Welles> . ?uri <http://dbpedia.org/property/distributor> <http://dbpedia.org/resource/RKO_Pictures>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Work>}