( And ( ( on ( one ( of ( ( ( these planets ) , ) ( the Earth ) ) ) ) ) ( , ( ( the ( first ( living cell ) ) ) ( ( arose ( ( ( around ( four billion ) ) years ) ago ) ) . ) ) ) ) )
(ROOT (S (CC And) (PP (IN on) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT these) (NNS planets)) (, ,) (NP (DT the) (NN Earth)))))) (, ,) (NP (DT the) (JJ first) (NN living) (NN cell)) (VP (VBD arose) (ADVP (NP (QP (RB around) (CD four) (CD billion)) (NNS years)) (RB ago))) (. .)))
And on one of these planets, the Earth, the first living cell arose around four billion years ago.
(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))))) (. .)))