Mature trees survive most surface fires because they have thick bark, branch-free boles, and a moderately deep rooting habit.
(Mature trees; survive; most surface fires; because they have thick bark, branch-free boles, and a moderately deep rooting habit) (they; have; thick bark, branch-free boles, and a moderately deep rooting habit)
Mature trees they
survive have
most surface fires because they have thick bark, branch-free boles, and a moderately deep rooting habit
thick bark, branch-free boles, and a moderately deep rooting habit