So I guess they went that far.
( So ( I ( ( guess ( they ( went ( that far ) ) ) ) . ) ) )
(ROOT (S (IN So) (NP (PRP I)) (VP (VBP guess) (SBAR (S (NP (PRP they)) (VP (VBD went) (ADVP (RB that) (RB far)))))) (. .)))
They went far I guess.
( They ( ( ( went far ) ( I guess ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD went) (ADVP (RB far)) (SBAR (S (NP (PRP I)) (VP (VBP guess))))) (. .)))