Simplify the following text for a Grade 9 native English-speaking person.
Original: As a child , he and his brother Lech KaczyÅ ski starred in the 1962 Polish movie The Two Who Stole The Moon `` O dwÃ ch takich , co ukradli ksiÄ Å 1\/4 yc '' , based on a popular Polish children 's story by Kornel MakuszyÅ ski .
Simplified: As children , JarosÅ aw and Lech KaczyÅ ski starred in the 1962 Polish film The Two Who Stole the Moon , based on a popular children 's story by Kornel MakuszyÅ ski .