( Prokaryotes ( ( are ( believed ( to ( be ( ( the ( first ( living organisms ) ) ) ( that ( developed ( ( ( 3.4 billion ) years ) ago ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Prokaryotes)) (VP (VBP are) (VP (VBN believed) (S (VP (TO to) (VP (VB be) (NP (NP (DT the) (JJ first) (NN living) (NNS organisms)) (SBAR (WHNP (WDT that)) (S (VP (VBD developed) (ADVP (NP (QP (CD 3.4) (CD billion)) (NNS years)) (RB ago))))))))))) (. .)))
Prokaryotes are believed to be the first living organisms that developed 3.4 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))))))))) (. .)))