that was followed by the bad idea 
(ROOT (SBAR (WHNP (DT that)) (S (VP (VBD was) (VP (VBN followed) (PP (IN by) (NP (DT the) (JJ bad) (NN idea))))))))
(ROOT (SBAR (WHNP (DT )) (S (VP (VBD ) (VP (VBN ) (PP (IN ) (NP (DT ) (JJ ) (NN ))))))))