If you want to have a simple golf swing; copy PGA Tour player Chad Campbell. He has one of the easiest motions to repeat. There are a lot of players in the world that are looking to make there swings more consistent. There are elements that Chad does that can help a lot of people.
There is often a lot of confusion around 'swing plane'. There are usually multiple explanations for 'swing plane', which of course is different from 'shoulder plane' and 'spine angle'. Swing plane refers to the club and the path that it travels on the backswing and downswing. Fortunately Chad Campbell simplifies it for us in the video below.
Chad Campbell Swing
Campbell does a great job of keeping his club on one path on his backswing, and then bringing it back to his ball on the same path during the downswing. It is a very short video, but try and pause it half way through his backswing. If you can pause it at the right spot you will see how the butt end of his club points at the golf ball. This is a great position to be in on the way back.
Now, if you can pause it again at the halfway point of his downswing then you will see that the butt end is still pointing at the golf ball. This is incredibly important for good ball striking.
You can get away with a backswing that does not follow Campbell's path (e.g. PGA Tour Player Jim Furyk) however, all good ball strikers get into the downswing position. Campbell just makes it simple by keeping the club on the path the whole time.
When you finish your backswing your hands should be just above your shoulders. Watch how close his hands are to his shoulders. One warning would be to make sure that they are not below the level of your shoulders. If they are below your shoulders your club will be flat, meaning more horizontal to the ground than the Campbell's swing plane. From this flat position it will be hard to hit your shots.