( He ( ( postulated ( that ( Pangaea ( ( ( existed ( ( ( about ( 250 million ) ) years ) ago ) ) and ) ( then ( ( broke up ) ( into ( ( several ( large sections ) ) ( that ( have ( continued ( to ( ( ( move away ) ( from one ) ) ( another ( to ( this day ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD postulated) (SBAR (IN that) (S (NP (NNP Pangaea)) (VP (VP (VBD existed) (ADVP (NP (QP (RB about) (CD 250) (CD million)) (NNS years)) (RB ago))) (CC and) (VP (ADVP (RB then)) (VBD broke) (PRT (RP up)) (PP (IN into) (NP (NP (JJ several) (JJ large) (NNS sections)) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (VP (VBN continued) (S (VP (TO to) (VP (VB move) (PRT (RP away)) (PP (IN from) (NP (CD one))) (NP (NP (DT another)) (PP (TO to) (NP (DT this) (NN day)))))))))))))))))) (. .)))
He postulated that Pangaea existed about 250 million years ago and then broke up into several large sections that have continued to move away from one another to this day.
(ROOT (S (NP (NNP Pangaea)) (VP (VBD began) (S (VP (VBG breaking) (ADVP (RB apart)) (ADVP (NP (QP (CD 250) (CD million)) (NNS years)) (RB ago))))) (. .)))