a lot of fun , with an undeniable energy 
(ROOT (NP (NP (DT a) (NN lot)) (PP (IN of) (NP (NN fun))) (, ,) (PP (IN with) (NP (DT an) (JJ undeniable) (NN energy)))))
(ROOT (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ))) (, ) (PP (IN ) (NP (DT ) (JJ ) (NN )))))