( ( ( ( Mercury , ) ( for example ) ) , ) ( ( is ( mercury ( which ( ( ( is ( a metal ) ) but ) ( is ( liquid ( at ( room temperature ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Mercury)) (, ,) (PP (IN for) (NP (NN example))) (, ,)) (VP (VBZ is) (NP (NP (NN mercury)) (SBAR (WHNP (WDT which)) (S (VP (VP (VBZ is) (NP (DT a) (NN metal))) (CC but) (VP (VBZ is) (ADJP (JJ liquid) (PP (IN at) (NP (NN room) (NN temperature)))))))))) (. .)))
Mercury, for example, is mercury which is a metal but is liquid 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)))))))) (. .)))