( ( By ( ( ( about ( 250 million ) ) years ) ago ) ) ( , ( ( ( the ( continued drifting ) ) ( of ( ( these continents ) ( ( resulted ( in ( their fusion ) ) ) ( into ( a ( single ( supercontinental landmass ) ) ) ) ) ) ) ) ( ( called Pangaea ) . ) ) ) )
(ROOT (S (PP (IN By) (ADVP (NP (QP (RB about) (CD 250) (CD million)) (NNS years)) (RB ago))) (, ,) (NP (NP (DT the) (JJ continued) (NN drifting)) (PP (IN of) (NP (NP (DT these) (NN continents)) (VP (VBN resulted) (PP (IN in) (NP (PRP$ their) (NN fusion))) (PP (IN into) (NP (DT a) (JJ single) (JJ supercontinental) (NNS landmass))))))) (VP (VBD called) (NP (NNP Pangaea))) (. .)))
By about 250 million years ago, the continued drifting of these continents resulted in their fusion into a single supercontinental landmass called Pangaea.
(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))))) (. .)))