Complex sentence: The PRVWSD is tasked to govern a 45 mile-long water basin comprising the Ross Barnett Reservoir and portions of the Pearl River, as well as land within one-quarter mile from the shoreline.
Split into simpler sentences: The PRVWSD is tasked to govern the 45 mile-long water basin comprising the Ross Barnett Reservoir and portions of the Pearl River. The district includes all land within one-quarter mile from the shoreline.