Simplify the following text for a Grade 10 native English-speaking person.
Original: Yulia Tymoshenko and Yushchenko where once strong allies ( during the Orange Revolution ) , today there is a lot of political misunderstanding between Tymoshenko and Yushchenko .
Simplified: A day earlier , Yushchenko 's former ally turned rival , Yulia Tymoshenko , took up the mantle as leader of the democratic opposition . But Yushchenko warned that her leadership will end in disaster `` Every political force that united with Tymoshenko ended badly '' .