( ( Origin ( of ( ( the ( first animals ) ) ( -LRB- ( ( Cambrian era ) -RRB- ) ) ) ) ) . )
(ROOT (NP (NP (NNP Origin)) (PP (IN of) (NP (NP (DT the) (JJ first) (NNS animals)) (PRN (-LRB- -LRB-) (NP (NNP Cambrian) (NN era)) (-RRB- -RRB-)))) (. .)))
Origin of the first animals (Cambrian era).
(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)))) (. .)))