Question: Which american football player's current team is Michigan Wolverines and former team was  Baltimore Ravens ?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/currentteam> <http://dbpedia.org/resource/Michigan_Wolverines> . ?uri <http://dbpedia.org/ontology/formerTeam> <http://dbpedia.org/resource/1998_Baltimore_Ravens_season>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/AmericanFootballPlayer>}