Complex sentence: The Allwinner A1X is known for its ability to boot GNU/Linux distributions such as Debian, Ubuntu, and other ARM architecture-capable distributions from an SD card, in addition to the Android OS usually installed on the flash memory of the device.
Split into simpler sentences: The Allwinner A1X is known for its ability to boot from an SD card GNU/Linux distributions such as Debian, Ubuntu, and other ARM architecture-capable GNU/Linux distributions. The ability is in addition to the Android OS usually installed on the Flash memory of the device.