"The table illustrates that entertainment of people who range from 30 to 50 years old differs widely between countries."

The table illustrates that the way people between the ages of 30 and 50 entertain themselves differs widely from country to country. The sentence is a bit weildy though.

I agree with Randy's comments. But, while Randy's sentence is fine, I personally would have added another word to the original sentence to be totally clear. "That entertainment of people......differs widely between countries." I would have said either "entertainment choices of" or "entertainment preferences of". Just a personal preference though.