Complex sentence: Occasionally the temperature will dip into the -20s, but Palmer doesn't typically experience the extreme cold (-50s (F) and below) of the Alaska Interior, as about from the coast, the ocean effect regulates the temperature from reaching any extremes.
Split into simpler sentences: Occasionally the temperature will dip into the -20's, but Palmer doesn't really experience the extreme cold (-50's) that can be seen in the Alaska Interior. Only about from the coast, the sea does a good job of regulating the temperature from reaching any extremes.