( Prokaryotes ( ( ( ( ( were ( ( the ( first forms ) ) ( of life ) ) ) ( on earth ) ) , ) ( ( evolving over ) ( ( ( 3.5 billion ) years ) ago ) ) ) . ) )
(ROOT (S (NP (NNS Prokaryotes)) (VP (VBD were) (NP (NP (DT the) (JJ first) (NNS forms)) (PP (IN of) (NP (NN life)))) (PP (IN on) (NP (NN earth))) (, ,) (VP (VBG evolving) (PRT (RP over)) (ADVP (NP (QP (CD 3.5) (CD billion)) (NNS years)) (RB ago)))) (. .)))
Prokaryotes were the first forms of life on earth, evolving over 3.5 billion years ago.
(ROOT (S (NP (NNS Prokaryotes)) (VP (VBD were) (NP (NP (DT the) (JJ first) (NN living) (NNS things)) (SBAR (S (VP (TO to) (VP (VB evolve) (PP (IN on) (NP (NN earth))))))))) (. .)))