Truth Today

When you need to put the reason of something in one sentence, it is difficult, but ironically not for you, but for the reader. The reader here, let's say employer, can built whole story onto one sentence you have wrote, for example, into your application form. That's why most people just avoiding difficulties, by writing something acceptable, but not even close to the truth. In this way, they are avoiding to trigger in potential employer, his or hers floating imagination. What would you do?