( Eventually ( , ( ( ( ( ( ( bigger ( water droplets ) ) ( form ( around ( the ( aerosol particles ) ) ) ) ) , ) and ) ( ( these ( water droplets ) ) ( start ( ( ( ( sticking together ) ( with ( other droplets ) ) ) , ) ( forming clouds ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Eventually)) (, ,) (S (NP (JJR bigger) (NN water) (NNS droplets)) (VP (VBP form) (PP (IN around) (NP (DT the) (JJ aerosol) (NNS particles))))) (, ,) (CC and) (S (NP (DT these) (NN water) (NNS droplets)) (VP (VBP start) (S (VP (VP (VBG sticking) (ADVP (RB together)) (PP (IN with) (NP (JJ other) (NNS droplets)))) (, ,) (VP (VBG forming) (NP (NNS clouds))))))) (. .)))
Eventually, bigger water droplets form around the aerosol particles, and these water droplets start sticking together with other droplets, forming clouds.
(ROOT (S (NP (NNS Clouds)) (VP (VBP are) (VP (VBN formed) (PP (IN from) (NP (NN water) (NNS droplets))))) (. .)))