The overall changes in vegetation seems to involve a drop in the most diverse ecosystems--woodlands divided into grasslands and forests, for example;
(The overall changes in vegetation; seems; ) (The overall changes in vegetation; to involve; a drop in the most diverse ecosystems) (woodlands; divided; into grasslands and forests)
The overall changes in vegetation The overall changes in vegetation woodlands
seems to involve divided
a drop in the most diverse ecosystems
into grasslands and forests