Complex sentence: A common mistake is that the larger "paddle" end should be used to hold the swizzle sick with, it is in fact the "paddle" end that should be used to stir the cocktail as it creates the most disturbance in the fluid.
Split into simpler sentences: A common mistake is using the larger "paddle" end to hold the swizzle sick with. In fact, the paddle end should be used to stir the cocktail as it creates the most disturbance in the fluid.