What is the position did William Henry Bragg have in the Royal Society, start and end date?
SELECT ?value1 ?value2 WHERE { wd:Q133747 p:P39 ?s . ?s ps:P39 wd:Q55713110 . ?s pq:P582 ?value1 . ?s pq:P580 ?value2 }
william henry bragg: Q133747 president of the royal society: Q55713110