Question: What team had a halfback on the roster and was coached by John Fox?
Answer(s):
answer: Denver Broncos

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.06_73l)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.06_73l ns:sports.sports_team_coach.teams_coached ?y .
?y ns:sports.sports_team_coach_tenure.team ?x .
?x ns:sports.sports_team.roster ?c .
?c ns:sports.sports_team_roster.position ns:m.02vkdwz . 
}