sentence: The tensions in the Soviet Union came to their peak in August 1991 . While Gorbachev was on vacation in the Crimea , a group of right wing military and KGB leaders staged a coup in Moscow .
modified: The tensions in the Soviet Union came to its peak in August 1991 , while Gorbachev was on vacation in the Crimea , a group of right wing military and KGB leaders staged a coup in Moscow .
transformation: DET, PUNCT