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