Complex sentence: Its annual visitor attendance is in excess of 200,000 people, and has often been awarded the prize of Norfolk's Top Attraction, by numerous different organisations, including "Best Large Attraction" by "Tourism in Norfolk" in 2010.
Split into simpler sentences: Its annual visitor attendance is in excess of 200,000 people. It was awarded the prize of "Best Large Attraction" by "Tourism in Norfolk" in 2010.