In that forest, there are plants that produces their own food, animals that feed on plants and animals that feed on another animals, then microorganisms feed upon these animals when they die and return them back to the plants.
(they; die; ) (plants; produces; their own food) (animals; feed; L:on plants and animals) (plants and animals; feed; ) (microorganisms; feed; upon these animals; T:when they die and return them back to the plants; T:then)
they plants animals plants and animals microorganisms
die produces feed feed feed
their own food
L:on plants and animals
upon these animals T:when they die and return them back to the plants T:then