( ( At ( this temperature ) ) ( , ( ( ( ( ( the lattice ) ( breaks down ) ) and ) ( ( the solid ) ( becomes ( a liquid ) ) ) ) . ) ) )
(ROOT (S (PP (IN At) (NP (DT this) (NN temperature))) (, ,) (S (NP (DT the) (NN lattice)) (VP (VBZ breaks) (PRT (RP down)))) (CC and) (S (NP (DT the) (JJ solid)) (VP (VBZ becomes) (NP (DT a) (NN liquid)))) (. .)))
At this temperature, the lattice breaks down and the solid becomes a liquid.
(ROOT (S (NP (NNS Gases) (CC and) (NNS liquids)) (VP (VBP become) (NP (NNS solids)) (PP (IN at) (NP (JJ low) (NNS temperatures)))) (. .)))
Gases and liquids become solids at low temperatures.