through this interminable , shapeless documentary about the swinging subculture 
(ROOT (PP (IN through) (NP (NP (DT this) (JJ interminable) (, ,) (JJ shapeless) (NN documentary)) (PP (IN about) (NP (DT the) (VBG swinging) (NN subculture))))))
(ROOT (PP (IN ) (NP (NP (DT ) (JJ ) (, ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (VBG ) (NN ))))))