Detailed Instructions: 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.
Problem:The Royal Institute of International Affairs , commonly known as Chatham House , is a not-for-profit and non-governmental organisation based in London whose mission is to analyse and promote the understanding of major international issues and current affairs .
Solution:
Chatham House , also known as the Royal Institute of International Affairs , is a London think tank .