(S (S (BASENP (NNP Silver) (NNP Birch)) (VP (VBZ has) (VP (VP (VBN won) (BASENP (DT the) (JJ 2007) (NNP Grand) (NNP National))) (PP (IN at) (NP (BASENP (NNP Aintree) (NNP Racecourse)) (PP (IN in) (BASENP (NNP Liverpool)))))))) (PERIOD .))