Complex sentence: Their current project is supposedly a turn-based PC RPG set during the zombie apocalypse, they are working on with Iron Tower Studios on the project, and it will be utilizing "Age of Decadence"' s game engine.
Split into simpler sentences: Their current project is supposedly a turn-based PC RPG set during the zombie apocalypse. They are working on with Iron Tower Studios on the project, and it will be utilizing "Age of Decadence"' s game engine.