Complex sentence: The Alamodome is a domed 65,000 seat, multi-purpose facility that is primarily used as a football/basketball stadium (football primarily) and convention center on the southeastern fringe of Downtown San Antonio, Texas, USA.
Split into simpler sentences: The Alamodome is a domed 65,000 seat, multi-purpose facility used as a football, basketball stadium and convention center. It's located on the southeastern fringe of Downtown San Antonio, Texas, USA.