(S (S (BASENP (PRP He)) (VP (VBZ heads) (NP (BASENP (NNP Impossible2Possible)) (COMMA ,) (NP (BASENP (DT a) (JJ nonprofit) (NN organization)) (SBAR (WHNP (WDT which)) (S (VP (VBZ advocates) (BASENP (NN planet) (NN protection))))))))) (PERIOD .))