Complex sentence: When they devour the festival audience, Satsuki turns on her mother, revealing her end goal has always been destroying Ragyo, but the rebellion is short-lived as Ragyo has fused with the Life Fibers to attain tremendous power.
Split into simpler sentences: When they devour the festival audience, Satsuki turns on her mother, revealing that stopping her was her life-long mission. But the rebellion is short-lived as Ragyo has fused with the Life Fibers to attain tremendous power.