Complex sentence: On September 10,2013, at their iPhone event, Apple announced that iOS 7 would be publicly released on September 18,2013, for iPhone, iPod Touch and iPad, the Golden Master of iOS 7 was released shortly after the event.
Split into simpler sentences: On September 10,2013, at their iPhone event, Apple announced that iOS 7 would be publicly released on September 18,2013, for iPhone, iPod Touch and iPad. The Golden Master of iOS 7 was released shortly after the event.