Complex sentence: Even the 1994 hardware released pre-V.34 was fully V.90-upgradeable without hardware modification; many Courier V.Everything modems were still in use more than a decade later.
Split into simpler sentences: Even the 1994 hardware released pre-V.34 was fully V.90-upgradeable without hardware modification. Many Courier V.Everything modems were still in use more than a decade later.