Complex sentence: A common misconception is that the emergency hatch in the roof of the elevator can be opened from inside of the elevator car, however this is rarely the case; instead being designed for the use of emergency crews to rescue trapped passengers.
Split into simpler sentences: A common misconception is that the emergency hatch in the roof of the elevator can be opened from inside of the elevator car. However, this is rarely the case, and these are, instead, designed for the use of emergency crews to rescue trapped passengers.