Simplify the following text for a Grade 11 native English-speaking person.
Original: Domestic repression inside Iraq grew worse , and Saddam 's sons , Uday Hussein and Qusay Hussein , became increasingly powerful and carried out a private reign of terror .
Simplified: Domestic repression inside Iraq grew worse , and Saddam 's sons , Uday and Qusay Hussein , became increasingly powerful and carried out a private reign of terror .