Question: Under which president did the predecessor of Simon Ferro work?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/successor> <http://dbpedia.org/resource/Simon_Ferro> . ?x <http://dbpedia.org/ontology/president> ?uri  . }
Answer: [Bill Clinton] is the president of the predecessor of Simon Ferro.