Complex sentence: Mikey, Christopher, and Nene travel together through the seven kingdoms to defeat the seven Dark Generals, learning that Nene's kid brother Ewan Amano is helping the Bagra Army after AxeKnightmon had tricked the boy into thinking the Digital World is a game for his pleasure.
Split into simpler sentences: Mikey, Christopher, and Nene travel together through the seven kingdoms to defeat the seven Dark Generals. Ewan joined the Bagra Army on the notion that the Digital World is a game for his pleasure.