Complex sentence: Google Maps is an application that was released by Google for Android on September 23,2008 and for iOS on December 13,2012 as an alternative to Apple's built-in maps application that was released with iOS 6.
Split into simpler sentences: Google Maps is an application that was released by Google for Android on September 23,2008 and iOS on December 13,2012. The application was released as an alternative to Apple's built-in maps application that was released with iOS 6.