Complex sentence: MV "Liberty Star" is one of two NASA-owned and United Space Alliance operated recovery ships tasked with retrieving spent Solid Rocket Boosters (SRB's) following the launch of Space Shuttle missions.
Split into simpler sentences: MV "Liberty Star" is one of two NASA-owned and United Space Alliance operated merchant vessels serving as recovery ships. Each is used in retrieving spent Solid Rocket Boosters (SRB's) following the launch of Space Shuttle missions.