Simplify the following text for a Grade 8 native English-speaking person.
Original: 19th Century In 1807 SuwaÅ ki became part of the newly formed Duchy of Warsaw and one of the centres of the department of Å omÅ 1\/4 a. After the defeat of Napoleon Bonaparte and the Congress of Vienna , the area was incorporated into the Kingdom of Poland .
Simplified: In 1807 SuwaÅ ki was taken by the Duchy of Warsaw . After losing Napoleon Bonaparte and the Congress of Vienna , the area was taken by Poland .