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.

[Q]: 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]: A doorstop ( or door stop or doorstopper ) is a tool .

[Q]: In chemistry and physics , activation energy is the energy which must be provided to a chemical or nuclear system with potential reactants to result in : a chemical reaction , nuclear reaction , or various other physical phenomena .
[A]: The activation energy of a chemical reaction is the minimum energy that is needed to make the reaction happen .

[Q]: The City of Wakefield is a local government district in West Yorkshire , England , with the status of a city and metropolitan borough .
[A]:
The City of Wakefield is in West Yorkshire , England .