 Then he ran.
( Then ( he ( ran . ) ) )
(ROOT (S (RB Then) (NP (PRP he)) (VP (VBD ran)) (. .)))
He ran like an athlete.
( He ( ( ran ( like ( an athlete ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD ran) (PP (IN like) (NP (DT an) (NN athlete)))) (. .)))