( ( ( The ( principal cause ) ) ( of ( secondary succession ) ) ) ( is ; ) )
(ROOT (S (NP (NP (DT The) (JJ principal) (NN cause)) (PP (IN of) (NP (JJ secondary) (NN succession)))) (VP (VBZ is)) (: ;)))
The principal cause of secondary succession is;
(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)))))))))) (. .)))