Task: Text Simplification
Input (English): backstory the general plot of the game is that a team of four , an alien , a human , an android , and a psionic , have left earth aboard a spacecraft on the basis of the planet 's imminent destruction.
Output (English): backstory the general plot of the game is that a team of four , an alien , a human , an android , and a psionic , have left earth and moved on a spacecraft on the basis of the planet 's fast approaching ruin.