It is probably the growth or most likely the conservation stage that is to be extended - there is hardly any reason to prolong other stages of the system's life cycle, and it is the delay of release and renewal, that would be sought.
(it; is; the delay of release and renewal, that would be sought) (the conservation stage; is; to be extended) (the delay of release and renewal; would be sought; ) (the conservation stage; to be extended; )
it the conservation stage the delay of release and renewal the conservation stage
is is would be sought to be extended
the delay of release and renewal, that would be sought
to be extended