( Mercury ( ( is ( ( a ( heavy metal ) ) ( which ( ( exists ( in ( ( ( a ( liquid state ) ) and ) evaporates ) ) ) ( at ( room temperature ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT a) (JJ heavy) (NN metal)) (SBAR (WHNP (WDT which)) (S (VP (VBZ exists) (PP (IN in) (NP (NP (DT a) (JJ liquid) (NN state)) (CC and) (NP (NNS evaporates)))) (PP (IN at) (NP (NN room) (NN temperature)))))))) (. .)))
Mercury is a heavy metal which exists in a liquid state and evaporates at room temperature.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (CD one) (NN metal)) (SBAR (WHNP (WDT that)) (S (VP (VBZ melts) (PP (IN below) (NP (NN room) (NN temperature)))))))) (. .)))