Question: What position did Kenneth Kaunda hold until 6-21-1971?
Paraphrase: Until June 21st, 1971, in what capacity did Kenneth Kaunda serve?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q105480 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1971')) }