Complex sentence: The game was initially released via Valve's Steam software for Microsoft Windows, OS X, and Linux on April 23,2013, with a PlayStation 4 port the following year and further versions for the PlayStation Vita, iOS, and mobile phones under consideration.
Split into simpler sentences: The game was initially released via Valve's Steam software for Microsoft Windows, OS X, and Linux on April 23,2013. A PlayStation 4 port became available the following year and further versions for the PlayStation Vita, iOS, and mobile phones are under consideration.