Question: Which celebrity who played Bella in Twilight ended a relationship prior to 2013?
Answer(s):
answer: Kristen Stewart

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.03nm_fh)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.03nm_fh ns:film.film.starring ?y .
?y ns:film.performance.actor ?x .
?y ns:film.performance.character ns:m.027b7y9 .
?x ns:celebrities.celebrity.sexual_relationships ?c .
?c ns:celebrities.romantic_relationship.end_date ?num .
FILTER (?num < "2013"^^xsd:dateTime) . 
}