Complex sentence: Berserko have decided to steal the bridge and give it to his uncle as a birthday gift even though Big Boss after he heard about wat Berserko is giving him is none too pleased about it.
Split into simpler sentences: Berserko have decided to steal the bridge and give it to his uncle as a birthday gift. Even though Big Boss, after he heard about what Berserko is giving him for his birthday, is none too pleased about it.