( ( When ( ( warm air ) ( is cooled ) ) ) ( , ( ( the ( water vapor ) ) ( ( ( ( condenses out ) and ) ( forms ( clouds ( which ( result ( in precipitation ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (JJ warm) (NN air)) (VP (VBZ is) (VP (VBN cooled))))) (, ,) (NP (DT the) (NN water) (NN vapor)) (VP (VP (VBZ condenses) (PRT (RP out))) (CC and) (VP (VBZ forms) (NP (NP (NNS clouds)) (SBAR (WHNP (WDT which)) (S (VP (VBP result) (PP (IN in) (NP (NN precipitation))))))))) (. .)))
When warm air is cooled, the water vapor condenses out and forms clouds which result in precipitation.
(ROOT (S (VP (VB Clouds) (NP (NP (NN form)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-)) (SBAR (WHADVP (WRB when)) (S (NP (NN water) (NN vapor)) (VP (VBZ condenses) (PP (IN in) (NP (NP (DT the) (NN air)) (PP (IN around) (NP (NP (NNS specs)) (PP (IN of) (NP (NN matter)))))))))))) (. .)))