( ( This ( decreased ( air pressure ) ) ) ( ( affects ( ( the ( way water ) ) boils ) ) . ) )
(ROOT (S (NP (DT This) (VBN decreased) (NN air) (NN pressure)) (VP (VBZ affects) (SBAR (S (NP (DT the) (NN way) (NN water)) (VP (VBZ boils))))) (. .)))
This decreased air pressure affects the way water boils.
(ROOT (S (NP (NNP External) (NN pressure)) (VP (VBZ affects) (NP (NP (DT the) (JJ boiling) (NN point)) (PP (IN of) (NP (NN water))))) (. .)))