but they 're simply not funny performers 
(ROOT (S (CC but) (NP (PRP they)) (VP (VBP 're) (ADVP (RB simply)) (RB not) (NP (JJ funny) (NNS performers)))))
(ROOT (S (CC ) (NP (PRP )) (VP (VBP ) (ADVP (RB )) (RB ) (NP (JJ ) (NNS )))))