Complex sentence: After some time, DAG is degraded, PKC is also enzimatically changed, (or intracellular Ca2 + levels decrease) and PKC detaches from the membrane and stops its phosphorilating activity.
Split into simpler sentences: After some time, DAG is degraded, PKC is also enzimatically changed, and/or intracellular Ca2 + levels decreas. When this happens, PKC detaches from the membrane and stops its phosphorilating activity.