( It ( ( ( became clear ) ( that ( ( ( the source ) ( of ( the chemicals ) ) ) ( was ( ( ( an ( abandoned waterway ) ) ( -LRB- ( ( Love Canal ) -RRB- ) ) ) ( ( into which ) ( ( Hooker Electrochemical ) ( ( dumped ( chemical waste ) ) ( until 1953 ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD became) (ADJP (JJ clear)) (SBAR (IN that) (S (NP (NP (DT the) (NN source)) (PP (IN of) (NP (DT the) (NNS chemicals)))) (VP (VBD was) (NP (NP (NP (DT an) (VBN abandoned) (NN waterway)) (PRN (-LRB- -LRB-) (NP (NNP Love) (NNP Canal)) (-RRB- -RRB-))) (SBAR (WHPP (IN into) (WHNP (WDT which))) (S (NP (NNP Hooker) (NNP Electrochemical)) (VP (VBD dumped) (NP (NN chemical) (NN waste)) (PP (IN until) (NP (CD 1953))))))))))) (. .)))
It became clear that the source of the chemicals was an abandoned waterway (Love Canal) into which Hooker Electrochemical dumped chemical waste until 1953.
(ROOT (S (NP (DT The) (NN love) (NN canal) (NN tragedy)) (VP (VBD was) (NP (NP (DT an) (JJ infamous) (NN example)) (PP (IN of) (NP (NP (JJ industrial) (NN waste)) (VP (VBG dumping)))))) (. .)))