Question: Mouse Morris' horses have raced in which races?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/trainer> <http://dbpedia.org/resource/Mouse_Morris> . ?x <http://dbpedia.org/property/race> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Horse>}