Complex sentence: The game begins in 1911, where former outlaw John Marston (Rob Wiethoff) is taken from his family by the Bureau of Investigation, and will only be granted amnesty when he brings the remaining members of his old gang to justice.
Split into simpler sentences: The game begins in 1911, where John Marston (Rob Wiethoff), a former outlaw, is taken from his family by the Bureau of Investigation. They state Marston will be granted amnesty if he brings the remaining members of his old gang to justice.