( Cambrian ( ( Geologic ( period ( that ( ( begins ( the ( Paleozoic Era ) ) ) ( ( ( 570 million ) years ) ago ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Cambrian)) (VP (VBZ Geologic) (NP (NP (NN period)) (SBAR (WHNP (WDT that)) (S (VP (VBZ begins) (NP (DT the) (JJ Paleozoic) (NN Era)) (ADVP (NP (QP (CD 570) (CD million)) (NNS years)) (RB ago))))))) (. .)))
Cambrian Geologic period that begins the Paleozoic Era 570 million years ago.
(ROOT (S (NP (NP (DT The) (JJ first) (NN period)) (PP (IN of) (NP (DT the) (JJ paleozoic) (NN era)))) (VP (VBD was) (VP (VBN called) (NP (NN cambrian)))) (. .)))