Complex sentence: The latest released version, 4.4.4 "KitKat" as security-only update, appeared on June 19,2014, just on the heels of 4.4.3.
Split into simpler sentences: The latest released version, 4.4.4 "KitKat" appeared as a security-only update. It was released on June 19,2014, shortly after the release of 4.4.3.