Simplify the following text for a Grade 11 native English-speaking person.
Original: Rules variations within the generic Pilota Valenciana category are frequent from area to area but the common trait is that the ball is struck with a bare , or almost bare , hand ( only some minimal protection is applied in some versions of the sport ) .
Simplified: Rules vary from area to area but the common trait is that the ball is struck with a bare , or almost bare , hand ( only some minimal protection is applied in some versions of the sport ) .