They result in a "top-heavy" ecosystem containing too many deer, while other animals - such as predators - are reduced in numbers.
(They; result; in a "top-heavy" ecosystem) (a "top-heavy" ecosystem; containing; too many deer) (other animals - such as predators; are reduced; L:in numbers)
They a "top-heavy" ecosystem other animals - such as predators
result containing are reduced
in a "top-heavy" ecosystem
too many deer
L:in numbers