Question: How long was Joseph Liouville a member of the FNA?
Paraphrase: For how long did Joseph Liouville belong to the FNA?
SPARQL (Wikidata): SELECT ?value1 ?value2 WHERE { wd:Q214549 p:P463 ?s . ?s ps:P463 wd:Q193582 . ?s pq:P580 ?value1 . ?s pq:P582 ?value2 }