Question: When was Bibi Andersson married to Per Ahlmark?
Paraphrase: When did the wedding of Bibi Andersson to Per Ahlmark take place?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q234921 p:P26 ?s . ?s ps:P26 wd:Q1347731 . ?s pq:P580 ?value}