Complex sentence: From about 1988 HP 3000s using PA-RISC processors began shipping in volume and, by 1995, effectively displaced the older family of machines from use although, as with all technology shifts, there remained a significant residue of older machines in service.
Split into simpler sentences: From about 1988, HP 3000s using PA-RISC processors began shipping in volume. As with all technology shifts, there remained a significant residue of older machines in service.