( ( ( the ( first ( living cell ) ) ) ( on Earth ) ) ( ( evolved ( ( ( some ( 12 billion ) ) years ) later ) ) ; ) )
(ROOT (S (NP (NP (DT the) (JJ first) (VBG living) (NN cell)) (PP (IN on) (NP (NNP Earth)))) (VP (VBD evolved) (ADVP (NP (QP (DT some) (CD 12) (CD billion)) (NNS years)) (RB later))) (: ;)))
the first living cell on Earth evolved some 12 billion years later;
(ROOT (S (NP (DT The) (JJ first) (VBG living) (NNS cells)) (VP (MD may) (VP (VB have) (VP (VBN evolved) (ADVP (NP (QP (RB around) (CD 4) (CD billion)) (NNS years)) (RB ago))))) (. .)))