Question: Which key person of the Clinton Foundation is also the president of Edward J. Perkins ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Edward_J._Perkins> <http://dbpedia.org/ontology/president> ?uri. <http://dbpedia.org/resource/Clinton_Foundation> <http://dbpedia.org/property/keyPeople> ?uri}