For nearly a century now golfers have been searching for a truly simple swing. Had one been discovered there would be millions of low-handicap golfers all around the world.
So I will not pretend to guarantee this simple swing recipe:
Swing with the upper arms.
Feel that the upper arms are always the same distance apart.
Feel that during the vital moments the right upper arm is swinging on a path ''inside'' that of the left arm. Or vice versa.
Pay attention to the ball. See the strike, if you can. Be aware of your target.
Then swing the club with the upper arms, the right traveling until the very end always ''inside'' the left.