Question: What is the nationality of the J. T. Krogh which is also the  sovereign state of the Camilla Martin
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { res:J._T._Krogh onto:nationality ?uri. res:Camilla_Martin onto:country ?uri}