Complex sentence: In August 2013 Robert Szeleney announced the release of a public beta on the SkyOS website, which allows public users to download a Live CD of the SkyOS operating system, fror testing and to optionally install the system.
Split into simpler sentences: In August 2013 Robert Szeleney announced the release of a public beta on the SkyOS website. This allows public users to download a Live CD of the SkyOS operating system, for testing and to optionally install the system.