Complex sentence: Over the next four years, the market for home personal computers skyrocketed, and by 1982, Apple has completed its initial public offering (IPO) and became a Fortune 500 company with over one thousand employees.
Split into simpler sentences: Over the next four years, the market for home personal computers skyrocketed. By 1982, Apple had completed its initial public offering (IPO) and become a Fortune 500 company with over one thousand employees.