( ( ( ( ( Almost ( all ( elemental mercury ) ) ) , ) ( which ( can ( ( cause ( severe ( air contamination ) ) ) ( if spilled ) ) ) ) ) , ) ( ( has ( been ( removed ( from ( the College ) ) ) ) ) . ) )
(ROOT (S (NP (NP (RB Almost) (DT all) (JJ elemental) (NN mercury)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD can) (VP (VB cause) (NP (JJ severe) (NN air) (NN contamination)) (SBAR (IN if) (S (VP (VBD spilled)))))))) (, ,)) (VP (VBZ has) (VP (VBN been) (VP (VBN removed) (PP (IN from) (NP (DT the) (NNP College)))))) (. .)))
Almost all elemental mercury, which can cause severe air contamination if spilled, has been removed from the College.
(ROOT (S (NP (NNP Air)) (VP (MD can) (VP (VB be) (VP (VBN separated) (PP (IN into) (NP (JJ several) (NNS elements)))))) (. .)))