The major organisms that need to be studied are those of the decomposer and detrital food chains.
(The major organisms; need; to be studied) (The major organisms; to be studied; ) (The major organisms that need to be studied; are; those of the decomposer and detrital food chains)
The major organisms The major organisms The major organisms that need to be studied
need to be studied are
to be studied
those of the decomposer and detrital food chains