Complex sentence: It was the most-watched episode of any entertainment series since the premiere episode of the second season of "Survivor" although the ratings may have received a boost from a snowstorm that made more people stay inside than usual.
Split into simpler sentences: It was the most-watched episode of any entertainment series since the premiere episode of the second season of "Survivor". The ratings may have received a boost from a snowstorm that made more people stay inside than usual.