Complex sentence: With approximately 312 glaciers, North Cascades National Park has the most glaciers of any U.S. park outside Alaska and a third of all the glaciers in the lower 48 states are located in the park.
Split into simpler sentences: With approximately 312 glaciers, North Cascades National Park has the most glaciers of any U.S. park outside Alaska. One-third of all the glaciers in the lower 48 states are located in the park.