instruction:
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.
question:
Several radioactive substances are considered carcinogens , but their carcinogenic activity is attributed to the radiation , for example gamma rays and alpha particles , which they emit .
answer:
The carcinogens in them are caused by the radiation they release , such as gamma rays or alpha particles .


question:
The eighteenth edition , which came out in 2012 , was edited by poet , critic , and editor Geoffrey O 'Brien ( O 'Brien is also the editor-in-chief of the Library of America ) .
answer:
The eighteenth edition ( 2012 ) was edited by poet , critic , and editor Geoffrey O 'Brien .


question:
Belarus declared itself sovereign on 27 July 1990 by issuing the Declaration of State Sovereignty of the Belarusian Soviet Socialist Republic .
answer:

Belarus said it was free on 27 July 1990 .