Complex sentence: The North Cascade Glacier Climate Project measures the annual balance of 10 glaciers, more than any other program in North America, to monitor an entire glaciated mountain range, which was listed as a high priority of the National Academy of Sciences in 1983.
Split into simpler sentences: The North Cascade Glacier Climate Project measures the annual balance of 10 glaciers, more than any other program in North America. To monitor an entire glaciated mountain range in North America, which was listed as a high priority of the National Academy of Sciences in 1983.