Question: What soviet leader died on 1971-09-11 and was active during World War 2?
Answer(s):
answer: Leonid Brezhnev

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.05vz3zq)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.05vz3zq ns:government.governmental_jurisdiction.governing_officials ?y .
?y ns:government.government_position_held.office_holder ?x .
?x ns:military.military_person.participated_in_conflicts ns:m.081pw .
?x ns:people.deceased_person.date_of_death ?num .
FILTER (?num > "1971-09-11"^^xsd:dateTime) . 
}