Complex sentence: Alligators have created a niche in wet prairies; with their claws and snouts they dig at low spots and create ponds free of vegetation that remain submerged throughout the dry season.
Split into simpler sentences: Alligators have created a niche in wet prairies due to their activity. With their claws and snouts they dig at low spots and create ponds free of vegetation that remain submerged throughout the dry season.