their sexual and romantic tension , while never really vocalized , is palpable 
(ROOT (S (NP (PRP$ their) (ADJP (JJ sexual) (CC and) (JJ romantic)) (NN tension)) (, ,) (SBAR (IN while) (S (ADVP (RB never)) (ADVP (RB really)) (VP (VBN vocalized)))) (, ,) (VP (VBZ is) (ADJP (JJ palpable)))))
(ROOT (S (NP (PRP$ ) (ADJP (JJ ) (CC ) (JJ )) (NN )) (, ) (SBAR (IN ) (S (ADVP (RB )) (ADVP (RB )) (VP (VBN )))) (, ) (VP (VBZ ) (ADJP (JJ )))))