Complex sentence: Individuals which are recently dead or dying are sometimes found on beaches with much of the textured skin and cilia still intact, and dead individuals are commonly found with the empty test devoid of all surface material and bleached white by sunlight.
Split into simpler sentences: Individuals which are very recently dead or dying (moribund) are sometimes found on beaches with much of the external morphology still intact. Dead individuals are commonly found with their empty test devoid of all surface material and bleached white by sunlight.