Complex sentence: A fish which can withstand many different environments, the creek chub's current range is the eastern two-thirds of the US and southeastern Canadn quickly adapt to different extreme environments like snow/freezing temp., and can live on many different foods.
Split into simpler sentences: A fish which can withstand many different environments, the creek chub's current range is the eastern two-thirds of the US and southeastern Canada. It can quickly adapt to different extreme environments, and can live on many different foods.