pile too many `` serious issues '' on its plate at times , yet 
(ROOT (S (VP (VB pile) (NP (ADJP (RB too) (JJ many)) (`` ``) (JJ serious) (NNS issues) ('' '')) (PP (IN on) (NP (PRP$ its) (NN plate))) (PP (IN at) (NP (NNS times)))) (, ,) (ADVP (CC yet))))
(ROOT (S (VP (VB ) (NP (ADJP (RB ) (JJ )) (`` ) (JJ ) (NNS ) ('' )) (PP (IN ) (NP (PRP$ ) (NN ))) (PP (IN ) (NP (NNS )))) (, ) (ADVP (CC ))))