Complex sentence: Role-playing game software, as opposed to role-playing video games, is software intended to assist in the development and running of role-playing games, but which does not allow for the game to be played entirely within the computer.
Split into simpler sentences: Role-playing game software, as opposed to role-playing video games, is a software intended to assist in developing and running of role-playing games. It does not allow the game to be played entirely within the computer.