Complex sentence: By the time IBM introduced System/360, scientific calculations had shifted to floating point and mechanical calculators were no longer a competitor, so the 360's practice of using word lengths that were a power of two quickly became universal.
Split into simpler sentences: By the time IBM introduced System/360, scientific calculations had shifted to floating point and mechanical calculators were no longer a competitor. So the 360's practice of using word lengths that were a power of two quickly became universal.