The fossil fuels (i.e. coal, oil, natural gas, etc.) derive from the decay of vegetable matter and are used by man as a source of energy.
(The fossil fuels; derive; from the decay of vegetable matter) (The fossil fuels; are used; by man; as a source of energy)
The fossil fuels The fossil fuels
derive are used
from the decay of vegetable matter
by man as a source of energy