Complex sentence: The four track him through to the Dominican Republic, and take the list (stored on a thumb drive and already decoded by Sweeney's partner) back in which they ponder over the possibilities on how to flush out those whose names are in the bible.
Split into simpler sentences: The four track him through to the Dominican Republic and take back the list, which is stored on a thumb drive and already decoded by Sweeney's partner. Afterward, they ponder the possibilities on how to properly flush out those whose names are in the bible.