Complex sentence: The company launched the Handspring Visor line of products on September 14,1999 which, unlike most products produced by Palm at the time, used USB to synchronize with the desktop computer and included an expansion port.
Split into simpler sentences: The company launched the Handspring Visor line of products on September 14,1999. Unlike most products produced by Palm at the time, they used USB to synchronize with the desktop computer and included an expansion port.