in a series of relentlessly nasty situations 
(ROOT (PP (IN in) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (ADJP (RB relentlessly) (JJ nasty)) (NNS situations))))))
(ROOT (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (ADJP (RB ) (JJ )) (NNS ))))))