Because the environment is very harsh, only a few kinds of plants and animals can live there, but little by little they will turn the desert-like, gray landscape into a forest.
(the environment; is; very harsh) (only a few kinds of plants and animals; can live; L:there) (they; will turn; the desert-like, gray landscape; into a forest)
the environment only a few kinds of plants and animals they
is can live will turn
very harsh
L:there
the desert-like, gray landscape into a forest