( ( As ( ( the ( frozen ( carbon dioxide ) ) ) sublimes ) ) ( , ( ( the ( carbon ( dioxide gas ) ) ) ( ( ( is ( ( so ( much colder ) ) ( than ( ( the ( water vapor ) ) ( in ( the air ) ) ) ) ) ) ( that ( ( the vapor ) condenses ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (DT the) (JJ frozen) (NN carbon) (NN dioxide)) (VP (VBZ sublimes)))) (, ,) (NP (DT the) (NN carbon) (NN dioxide) (NN gas)) (VP (VBZ is) (ADJP (ADJP (RB so) (RB much) (JJ colder)) (PP (IN than) (NP (NP (DT the) (NN water) (NN vapor)) (PP (IN in) (NP (DT the) (NN air)))))) (SBAR (IN that) (S (NP (DT the) (NN vapor)) (VP (VBZ condenses))))) (. .)))
As the frozen carbon dioxide sublimes, the carbon dioxide gas is so much colder than the water vapor in the air that the vapor condenses.
(ROOT (S (NP (NP (DT The) (NN combustion)) (PP (IN of) (NP (NN propane) (NN gas)))) (VP (VBZ produces) (NP (NP (NN carbon) (NN dioxide)) (CC and) (NP (NN water) (NN vapor)))) (. .)))