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.
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Question: Cygnus X-1 ( abbreviated Cyg X-1 ) is a galactic X-ray source in the constellation Cygnus , and the first such source widely accepted to be a black hole .

Answer: Cygnus X-1 was the first X-ray source accepted as a black hole .

Question: Petroleum refining processes are the chemical engineering processes and other facilities used in petroleum refineries ( also referred to as oil refineries ) to transform crude oil into useful products such as liquefied petroleum gas ( LPG ) , gasoline or petrol , kerosene , jet fuel , diesel oil and fuel oils .

Answer: Oil refining is the name for a number of processes from chemical engineering , which transform crude oil into useful products such as different fuel oils , Liquefied petroleum gas , gasoline , kerosene or diesel oil .

Question: He is former president and co-founder of the Bahrain Centre for Human Rights ( BCHR ) , a nonprofit non-governmental organisation which works to promote human rights in Bahrain .

Answer:
He is former president and co-founder of the Bahrain Centre for Human Rights ( BCHR ) .