In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

A doorstop ( also door stopper , door stop or door wedge ) is an object or device used to hold a door open or closed , or to prevent a door from opening too widely .
A doorstop ( or door stop or doorstopper ) is a tool .

A virtual learning environment ( VLE ) in educational technology is a Web-based platform for the digital aspects of courses of study , usually within educational institutions .
A virtual learning environment ( VLE ) is a kind of e-learning system placed on a website .

He acknowledged the heavy moral sacrifice that giving up Stalingrad would mean , but this would be made easier to bear by conserving the combat power of the Sixth Army and regaining the initiative .

He said that giving up Stalingrad would be a difficult loss , but that it would keep the Sixth Army intact .