Complex sentence: Huxley model which proposes that signals travel as action potentials: voltage-gated ion channels in the membrane open and allow ions to rush into the cell, thereby leading to the opening of other nearby ion channels and thus propagating the signal in an essentially electrical manner.
Split into simpler sentences: Huxley model which proposes that signals travel as action potentials: voltage-gated ion channels in the membrane open and allow ions to rush into the cell. The change in potential influences other nearby ion channels thereby opening them and thus propagating the signal in an essentially electrical manner.