Most of the tidal effect is the result of the gravitational attraction of the moon and earth, with a lesser effect caused by the sun's gravitational effect.
(Most of the tidal effect; is; the result of the gravitational attraction of the moon and earth, with a lesser effect) (a lesser effect; caused; by the sun's gravitational effect)
Most of the tidal effect a lesser effect
is caused
the result of the gravitational attraction of the moon and earth, with a lesser effect
by the sun's gravitational effect