Question: Which races has the horse bred by Jacques Van't Hart participated in?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/breeder> <http://dbpedia.org/resource/Jacques_Van't_Hart> . ?x <http://dbpedia.org/property/race> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Horse>}