Complex sentence: To save her, Dresden makes an offer too good to pass up: in exchange for the Archive, Dresden will give Nicodemus all the coins that the Knights of the Cross have collected (11) and a Sword of the Cross.
Split into simpler sentences: To save her, Dresden makes an offer that's too good to pass up. In exchange for the Archive, Dresden will give Nicodemus all the denarii that the Knights of the Cross have collected (11) and a Sword of the Cross.