Question: Mention the year span in which Edward Heath became head authority of the Member of the 43rd Parliament of the United Kingdom besides the reason for his tenure quit.
Paraphrase: In time span was Edward Heath the head authority of the 43rd parliament of the U.K?
SPARQL (Wikidata): SELECT ?value1 ?value2 WHERE { wd:Q128967 p:P39 ?s . ?s ps:P39 wd:Q41582608 . ?s pq:P2715 ?value1 . ?s pq:P1534 ?value2 }