Complex sentence: Game saving is usually done with in presence of a save point (a camera on a stand) which may be found in different parts of the mansion, however the game may also be saved at the end of each chapter.
Split into simpler sentences: Game saving is done usually with the presence of a save point (which is a camera on a stand), an object that can be found in different parts of the mansion. The game can also be saved at the end of each chapter.