Complex sentence: The company employs 115,000 permanent full-time employees and maintains 453 retail stores in sixteen countries; it operates the online Apple Store and iTunes Store, the latter of which is the world's largest music retailer.
Split into simpler sentences: The company employs 115,000 permanent full-time employees and maintains 453 retail stores in sixteen countries. It operates the online Apple Store and iTunes Store, the latter of which is the world's largest music retailer.