Question: When was Jacobus Henricus van 't Hoff awarded the Helmoltzh Medal?
Paraphrase: The Helmoltzh Medal was awarded to Jacobus Henricus van't Hoff on what date?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q102822 p:P166 ?s . ?s ps:P166 wd:Q1562616 . ?s pq:P585 ?value}