The long-term absence of fire appears to be the most likely cause of this change from an open grassy woodland to a closed low forest.
(The long-term absence of fire; appears; ) (The long-term absence of fire; to be; the most likely cause of this change from an open grassy woodland to a closed low forest)
The long-term absence of fire The long-term absence of fire
appears to be
the most likely cause of this change from an open grassy woodland to a closed low forest