Complex sentence: Required navigation performance (RNP) is defined by ICAO as "a statement of the navigation performance necessary for operation within a defined airspace", and it is significant because greatly enhances the number of aircraft that can occupy a particular airspace without compromising safety.
Split into simpler sentences: Required navigation performance (RNP) is defined by ICAO as "a statement of the navigation performance necessary for operation within a defined airspace". It is significant because it greatly enhances the number of aircraft that can occupy a particular airspace without compromising safety.