Complex sentence: Dozens of other operating systems also use the acronym "DOS", including DOS/360 (1966), Apple DOS, Apple ProDOS, Atari DOS, Commodore DOS, TRSDOS, and AmigaDOS.
Split into simpler sentences: Dozens of other operating systems also use the acronym "DOS", including DOS/360 from 1966. Others are Apple DOS, Apple ProDOS, Atari DOS, Commodore DOS, TRSDOS, and AmigaDOS.