Which venues are located at places governed by John Roberts?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/leader> <http://dbpedia.org/resource/John_Roberts> . ?uri <http://dbpedia.org/property/address> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Venue>}
John_Roberts