Question: Who was Herbert von Karajan employed by when he was replaced by Paul van Kempen?
Paraphrase: When he was replaced by Paul van Kempen, who was Herbert von Karajan's employer?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q154895 p:P108 ?s . ?s ps:P108 ?obj . ?s pq:P1366 wd:Q529444 }