Since they have fewer places where eggs and tadpoles can grow, the numbers of adult frogs and toads are reduced.
(they; have; fewer places where eggs and tadpoles can grow) (eggs and tadpoles; can grow; L:fewer places) (the numbers of adult frogs and toads; are reduced; )
they eggs and tadpoles the numbers of adult frogs and toads
have can grow are reduced
fewer places where eggs and tadpoles can grow
L:fewer places