( ( ( ( respiratory system ) and ) ( available non-lethal ) ) ( ( air ( to breathe ) ) . ) )
(ROOT (S (NP (NP (JJ respiratory) (NN system)) (CC and) (NP (JJ available) (NNS non-lethal))) (VP (NN air) (S (VP (TO to) (VP (VB breathe))))) (. .)))
respiratory system and available non-lethal air to breathe.
(ROOT (S (NP (NNP Narrow) (NN air) (NNS passages)) (VP (VBP make) (S (VP (VBG breathing) (ADJP (JJ difficult) (RB due) (S (VP (TO to) (VP (VB respiratory) (NP (NN system) (NN disease))))))))) (. .)))