Complex sentence: As part of the nervous system they are very closely related to nerve cells and like all other glial cells the oligodendrocytes have a supporting role towards neurons and are intimately involved in signal propagation, providing the same functionality as the insulation on a household electrical wire.
Split into simpler sentences: As part of the nervous system they are closely related to nerve cells and like all other glial cells the oligodendrocytes have a supporting role towards neurons. They are intimately involved in signal propagation, providing the same functionality as the insulation on a household electrical wire.