If the direction of the current is reversed, the North Pole changes to South Pole and the South Pole changes to North Pole.
(the direction of the current; is reversed; ) (the North Pole; changes; to South Pole and the South Pole) (the North Pole; changes; to North Pole)
the direction of the current the North Pole the North Pole
is reversed changes changes
to South Pole and the South Pole
to North Pole