Complex sentence: The primary reason for the bank to be created was the extreme temperatures in the area, up to 40 degrees Celsius (104 degrees Fahrenheit) in the summer time, because of that they had to ensure the protection of the grains all year around.
Split into simpler sentences: The primary reason for the bank to be created was the extreme temperatures in the area, up to 40 degrees Celsius (104 degrees Fahrenheit) in the summer time. Because of that they had to ensure the protection of the grains all year around.