The original environment may have been optimal for the first species of plant or animal, but the newly altered environment is often optimal for some other species of plant or animal.
(The original environment; may have been; optimal for the first species of plant or animal) (the newly altered environment; is; T:often; optimal for some other species of plant or animal)
The original environment the newly altered environment
may have been is
optimal for the first species of plant or animal
T:often optimal for some other species of plant or animal