Complex sentence: This architecture has now become the predominant 64-bit architecture in the desktop and portable market; although some Itanium-based workstations were initially introduced by companies such as SGI, these are no longer available.
Split into simpler sentences: This architecture has now become the predominant 64-bit architecture in the desktop and portable market. Although some Itanium-based workstations were initially introduced by companies such as SGI, they are no longer available.