Question: What are the other key people of the non-profit organisations whose one of the key person is Joe Green?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/keyPeople> <http://dbpedia.org/resource/Joe_Green_(entrepreneur)> . ?x <http://dbpedia.org/property/keyPeople> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Non-ProfitOrganisation>}
Answer: The key people of the non-profit organisations whose one key person is Joe Green are [Jen Martin, Rob Jesmer, Joe Green (entrepreneur), Mark Zuckerberg, Todd Schulte].