Complex sentence: The game was previously announced as "Metro 2034", the game is a sequel to the video game "Metro 2033", and although Glukhovsky has apparently been working with the developers, it bears no relation to the book "Metro 2034".
Split into simpler sentences: The game was previously announced as "Metro 2034", the game is a sequel to the video game "Metro 2033". Regardless of the fact that author Glukhovsky has apparently been working with the developers, it bears no relation to the book "Metro 2034".