Complex sentence: With the truth revealed, Niall asked Myra 6 questions, for each one she got right, she could choose one of her children to live and each she got wrong, she could choose one to die.
Split into simpler sentences: With the truth revealed, Niall asked Myra 6 questions. For each one she got right, she could choose one of her children to live and each she got wrong, she could choose one to die.