Complex sentence: Visitors are advised to stay for a full tidal cycle to a full appreciation of the formation and the water goes up to 46 feet (14 meters) high and has the world record for the highest average tides in the world.
Split into simpler sentences: Visitors are advised to stay for a full tidal cycle to get a full appreciation of the tides and formations. Although the tides vary from day to day, the high tide can be as high as 46 feet (14 meters) giving The Hopewell Rocks the world record for the highest average tides in the world.