Given the task definition and input, reply with output. In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.

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.
backstory : the main idea of the game is that a team of four , an alien , a human , an android , and a psionic , have left earth on a spacecraft on the basis of the planet 's total destruction.