Q: 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.
the sahara pump theory is a hypothesis that explains how flora and fauna left africa to penetrate the middle east and then europe and asia.
A:
the sahara pump explanation -lrb- of why something works or happens the way it does -rrb- is an educated guess that explains how flora and fauna left africa to penetrate the middle east and then europe and asia.