Complex sentence: It is possible that a good amount of water drained from the glacial lake through a glacial tunnel flowing directly in front of the glacier, though neither the rate of drainage nor the volume of water drained could produce a wave run-off to be 1,720ft.
Split into simpler sentences: It is possible that a good amount of water drained from the glacial lake through a glacial tunnel flowing directly in front of the glacier. Though neither the rate of drainage nor the volume of water drained could produce a wave run-off to be 1,720ft.