( ( ( e.g. , ) ( ( ( primary succession ) , ) ( secondary succession ) ) ) . )
(ROOT (NP (NP (NNP e.g.)) (, ,) (NP (NP (JJ primary) (NN succession)) (, ,) (NP (JJ secondary) (NN succession))) (. .)))
e.g., primary succession, secondary succession.
(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)))))))))) (. .)))