SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/successor> <http://dbpedia.org/resource/Simon_Ferro> . ?x <http://dbpedia.org/ontology/president> ?uri . }
Under which president did the predecessor of Simon Ferro work?
SELECT DISTINCT ?h WHERE { ?e property:president ?h . . ?e property:successor resource:Simon_Ferro }
Bill Clinton
[Bill Clinton] is the president of the predecessor of Simon Ferro.
[Bill Clinton] is the president of Simon Ferro's predecessor.