Question: When did Luis Martinez de Galinsoga y de la Serna end his time as manager of La Vanguardia?
Paraphrase: When did Luis quit his manager job at La Vanguardia?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q511533 p:P1037 ?s . ?s ps:P1037 wd:Q11689899 . ?s pq:P582 ?value}