Complex sentence: An immediate effect of low levels of glucose and thus ATP, is the inactivation of the Na-K pump, which leads to the uptake of calcium ions, which activate lipases, proteases, and endonucleases which in the end, destroy the cell skeleton.
Split into simpler sentences: An immediate effect of low levels of glucose and thus ATP, is the inactivation of the Na-K pump. This leads to the uptake of calcium ions, which activate lipases, proteases, and endonucleases and destroys the cell skeleton.