This is obvious in an example Shepard uses himself - diurnal rhythms - for a diurnal animal exploits the rhythm to become active by day and sleep at night while a nocturnal animal does the reverse, but both can be described as internalisation of the rhythm.
(both; can be described; as internalisation of the rhythm) (Shepard; uses; himself - diurnal rhythms; for a diurnal animal) (a nocturnal animal; does; the reverse)
both Shepard a nocturnal animal
can be described uses does
as internalisation of the rhythm
himself - diurnal rhythms for a diurnal animal
the reverse