all the more poignant by the incessant use of cell phones 
(ROOT (S (ADJP (ADVP (PDT all) (DT the) (RBR more)) (JJ poignant)) (PP (IN by) (NP (NP (DT the) (JJ incessant) (NN use)) (PP (IN of) (NP (NN cell) (NNS phones)))))))
(ROOT (S (ADJP (ADVP (PDT ) (DT ) (RBR )) (JJ )) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN ) (NNS )))))))