But then, ha, ha that changed quickly.
( But ( then ( , ( ha ( , ( ( ha ( that ( changed quickly ) ) ) . ) ) ) ) ) )
(ROOT (S (CC But) (ADVP (RB then)) (, ,) (ADVP (RB ha)) (, ,) (VP (VBP ha) (SBAR (IN that) (S (VP (VBD changed) (ADVP (RB quickly)))))) (. .)))
That has changed quickly.
( That ( ( has ( changed quickly ) ) . ) )
(ROOT (S (NP (DT That)) (VP (VBZ has) (VP (VBN changed) (ADVP (RB quickly)))) (. .)))