Complex sentence: The program first appeared in version 6.0 and last appeared in version 6.22, the antivirus program was quite rudimentary and had no update facility and could scan for about 1,000 viruses.
Split into simpler sentences: The program first appeared in version 6.0 and last appeared in version 6.22. The antivirus program was quite rudimentary, had no update facility and could scan for about 1,000 viruses.