Question:  How many scientist have won an award by the society led by Venkatraman Ramakrishnan?
SPARQL:
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/leaderName> <http://dbpedia.org/resource/Venkatraman_Ramakrishnan> . ?uri <http://dbpedia.org/property/prizes> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Scientist>}