in a superficial way , while never sure 
(ROOT (S (PP (IN in) (NP (DT a) (JJ superficial) (NN way))) (, ,) (SBAR (IN while) (FRAG (ADJP (RB never) (JJ sure))))))
(ROOT (S (PP (IN ) (NP (DT ) (JJ ) (NN ))) (, ) (SBAR (IN ) (FRAG (ADJP (RB ) (JJ ))))))