Complex sentence: For full functionality, AirPods require devices running at minimum iOS 10.2, macOS Sierra or watchOS 3, and it automatically syncs through iCloud so that the user can switch to other supported devices signed in to the same Apple ID.
Split into simpler sentences: For full functionality, AirPods require devices running at minimum iOS 10.2, macOS Sierra or watchOS 3. They automatically sync through iCloud so that the user can switch to other supported devices signed in to the same Apple ID.