Then he sobered.
( Then ( he ( sobered . ) ) )
(ROOT (S (RB Then) (NP (PRP he)) (VP (VBD sobered)) (. .)))
He was always sober.
( He ( ( ( was always ) sober ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD was) (ADVP (RB always)) (ADJP (JJ sober))) (. .)))