Complex sentence: The cold, fresh water from the Saguenay and the warmer, salty water of the St. Lawrence, meet to create a rich marine environment, including an abundance of krill, making the area very attractive to whales.
Split into simpler sentences: The cold, fresh water from the Saguenay and the warmer, salty water of the St. Lawrence, meet to create a rich marine environment. The rivers support an abundance of krill, making the area very attractive to whales.