Simplify the following text for a Grade 10 native English-speaking person.
Original: Ustashe 's unseen cruelty and savagery applied against Serbs and Jews even prompted the German command to demand that FrancetiÄ , as the commander of the 1st Brigade Black Legion , be dismissed which PaveliÄ refused , promoting FrancetiÄ to commander of all Ustashe field formations .
Simplified: Ustashe 's unseen cruelty and savagery applied against Serbs and Jews even prompted the German command to demand that FrancetiÄ , as the commander of the 1st Brigade Black Legion , be dismissed . PaveliÄ defied and promoted FrancetiÄ to commander of all Ustashe field formations .