Complex sentence: By the mid- 1960's computers were used for everything from accounting, to point-of-sale, to inventory management, while business data communication by electronic means was, for practical purposes, still in the telegraph age.
Split into simpler sentences: By the mid- 1960's computers were used for everything from accounting, to point-of-sale, to inventory management. However, for practical purposes business data communication by electronic means was still in the telegraph age.