(S (S (BASENP (DT The) (NN donor) (NNS arms)) (VP (VBD came) (PP (IN from) (NP (BASENP (DT an) (JJ unnamed) (NN teenager)) (COMMA ,) (SBAR (WHNP (WP who)) (S (VP (VBZ is) (VP (VBN believed) (S (VP (TO to) (VP (VB have) (VP (VBN died) (PP (IN in) (BASENP (DT a) (NN car) (NN accident))))))))))))))) (PERIOD .))