As predators at the top of the food chain, they help control numbers of rodents and other animals that might overtax the marshland vegetation.
(numbers of rodents and other animals; might overtax; the marshland vegetation) (they; help; control numbers of rodents and other animals) Context(they help,List([43, 52))):(they; help control; numbers of rodents and other animals that might overtax the marshland vegetation)
they help,List([43, 52))
numbers of rodents and other animals they they
might overtax help help control
the marshland vegetation
control numbers of rodents and other animals
numbers of rodents and other animals that might overtax the marshland vegetation