Original sentence: By 1996 a total of 23,326 people, over 5% of Russophone community in Estonia, had been naturalized by this procedure.Other noncitizens had to pass exams in the Estonian language, the Estonian history, and the Constitution of the Republic of Estonia in order to naturalise
Edited sentence: By 1996 a total of 23,326 people (out of approximately 370,000 Russophones who chose to live in Estonia after the USSR broke up) had been naturalized by this procedure..  Other noncitizens had to pass exams in the Estonian language, the Estonian history, and the Constitution of the Republic of Estonia in order to naturalise