of important developments of the computer industry 
(ROOT (PP (IN of) (NP (NP (JJ important) (NNS developments)) (PP (IN of) (NP (DT the) (NN computer) (NN industry))))))
(ROOT (PP (IN ) (NP (NP (JJ ) (NNS )) (PP (IN ) (NP (DT ) (NN ) (NN ))))))