(S (S (BASENP (PRPD His) (NN diet)) (VP (VBZ consists) (PP (IN of) (NP (NP (JJ freeze-dried) (BASENP (NNS foods) (CC and) (NNS fish))) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (VP (VBG keeping) (S (S (BASENP (PRP him)) (ADJP (RB physically) (JJ well-conditioned))) (PP (IN despite) (S (VP (VBG tiring) (ADVP (RB mentally)))))))))))))) (PERIOD .))