( ( Open burning ) ( ( ( ( pollutes ( the air ) ) and ) ( can ( make ( it ( ( difficult ( for ( people ( with ( respiratory problems ) ) ) ) ) ( to breathe ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Open) (NNP burning)) (VP (VP (VBZ pollutes) (NP (DT the) (NN air))) (CC and) (VP (MD can) (VP (VB make) (S (NP (PRP it)) (ADJP (JJ difficult) (PP (IN for) (NP (NP (NNS people)) (PP (IN with) (NP (JJ respiratory) (NNS problems)))))) (S (VP (TO to) (VP (VB breathe)))))))) (. .)))
Open burning pollutes the air and can make it difficult for people with respiratory problems 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))))))))) (. .)))