( ( ( ( ( ( ( The cold ) ( of ( the foil ) ) ) ( lowered ( ( the temperature ) ( of ( the ( water molecules ) ) ) ) ) ) , ) so ) ( they ( ( ( slowed down ) and ) ( ( became ( liquid water ) ) again ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN cold)) (PP (IN of) (NP (DT the) (NN foil)))) (VP (VBD lowered) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (DT the) (NN water) (NNS molecules)))))) (, ,) (IN so) (S (NP (PRP they)) (VP (VP (VBD slowed) (PRT (RP down))) (CC and) (VP (VBD became) (NP (JJ liquid) (NN water)) (ADVP (RB again))))) (. .)))
The cold of the foil lowered the temperature of the water molecules, so they slowed down and became liquid water again.
(ROOT (S (PP (IN As) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (NN water) (NNS decreases))))) (, ,) (NP (DT the) (NN water) (NNS molecules)) (VP (VB slow) (PRT (RP down))) (. .)))