Complex sentence: Meizu smartphones in the MX series and Note series run a customized version of Android, dubbed Flyme OS. Flyme is developed by Meizu, the latest version is upgraded to Flyme OS 4.5 running on top of Android 5.0 Lollipop.
Split into simpler sentences: Meizu smartphones in the MX series and Note series run a customized version of Android, dubbed Flyme OS. Flyme is developed by Meizu. The latest version is upgraded to Flyme OS 4.5 running on top of Android 5.0 Lollipop.