Complex sentence: In 1986, the company released memory upgrades for Apple Macintosh (Mac) computers as its first products, and in 1987, DayStar began to market processor upgrades exclusively for the Mac, the first being for the Apple Macintosh II computer.
Split into simpler sentences: In 1986, the company released memory upgrades for Apple Macintosh Computers, its first product. In 1987 the company began to market processor upgrades exclusively for the Mac, the first one for the Apple Macintosh II computer.