( ( ( ( Forest succession ) ( on ( four ( habitat types ) ) ) ) ( in ( western Montana ) ) ) . )
(ROOT (NP (NP (NN Forest) (NN succession)) (PP (IN on) (NP (CD four) (NN habitat) (NNS types))) (PP (IN in) (NP (JJ western) (NNP Montana))) (. .)))
Forest        succession on four habitat types in western Montana.
(ROOT (S (NP (JJ Secondary) (NN succession)) (VP (VBZ is) (NP (NP (DT the) (NN type)) (PP (IN of) (NP (NN succession))) (SBAR (WHNP (WDT that)) (S (VP (VBZ happens) (PP (IN after) (NP (NP (DT the) (NN destruction)) (PP (IN of) (NP (DT a) (NN habitat)))))))))) (. .)))