Why did David Cameron, who held the position of Member of the 54th Parliament of the UK, leave office?
SELECT ?value1 ?value2 WHERE { wd:Q192 p:P39 ?s . ?s ps:P39 wd:Q35647955 . ?s pq:P1534 ?value1 . ?s pq:P2715 ?value2 }
david cameron: Q192 member of the 54th parliament of the united kingdom: Q35647955