( ( As ( ( the ( water vapor ) ) cools ) ) ( , ( it ( ( ( condenses , ) ( ( forming ( tiny droplets ) ) ( in clouds ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (DT the) (NN water) (NN vapor)) (VP (VBZ cools)))) (, ,) (NP (PRP it)) (VP (VBZ condenses) (, ,) (S (VP (VBG forming) (NP (JJ tiny) (NNS droplets)) (PP (IN in) (NP (NNS clouds)))))) (. .)))
As the water vapor cools, it condenses , forming tiny droplets in clouds.
(ROOT (S (NP (NNS Clouds)) (VP (VBP are) (VP (VBN formed) (PP (IN from) (NP (NN water) (NNS droplets))))) (. .)))