Complex sentence: A new mechanic in the game is that there are no doors to block the actions of the animatronics, and instead the player must put on a Freddy Fazbear mask to avoid being killed.
Split into simpler sentences: A new mechanic in the game is that there are no doors to block the actions of the animatronics. Instead, the player must put on a Freddy Fazbear mask to avoid being killed.