Simplify the following text for a Grade 4 native English-speaking person.
Original: ( Aged 16 ) When the plot fails , Naraku revives Sango 's little brother Kohaku , controlling him as a pawn to manipulate Sango 's emotions and attack the rest of Inuyasha 's group . Sango seeks vengeance against Naraku , but her primary goal is to rescue Kohaku from Naraku 's influence and save his life .
Simplified: Sango 's new aim is to also save Kohaku from Naraku 's control .