Complex sentence: The Research Libraries Group (RLG) was a U.S.-based library consortium which developed the Eureka interlibrary search engine, the RedLightGreen database of bibliographic descriptions and ArchiveGrid, a database containing descriptions of archival collections.
Split into simpler sentences: The Research Libraries Group (RLG) was a U.S.-based library consortium. They developed the Eureka interlibrary search engine, the RedLightGreen database of bibliographic descriptions, and ArchiveGrid, a database containing descriptions of archival collections.