( ( If ( ( the ( cancerous tumor ) ) ( is ( in ( ( ( an ( air passage ) ) or ) ( the throat ) ) ) ) ) ) ( , ( it ( ( can ( make ( breathing ( more difficult ) ) ) ) ; ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (JJ cancerous) (NN tumor)) (VP (VBZ is) (PP (IN in) (NP (NP (DT an) (NN air) (NN passage)) (CC or) (NP (DT the) (NN throat))))))) (, ,) (NP (PRP it)) (VP (MD can) (VP (VB make) (S (VP (VBG breathing) (ADJP (RBR more) (JJ difficult)))))) (: ;)))
If the cancerous tumor is in an air passage or the throat, it can make breathing more difficult;
(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))))))))) (. .)))