Simplify the following text for a Grade 6 native English-speaking person.
Original: It started on April 17 , 1794 , which was soon after Tadeusz KoÅ ciuszko 's victory at an important battle .
Simplified: It began April 17 , 1794 , soon after Tadeusz KoÅ ciuszko 's victory at RacÅ awice .