Complex sentence: All Assassins have a hollow tooth to hold a cyanide capsules and agents have standing orders to die rather than be captured, although when captured most Assassins do use the capsule, some the higher-ups in the organization aren't as quick too do so.
Split into simpler sentences: All Assassins have a hollow tooth to hold a cyanide capsule, and agents have standing orders to die rather than be captured. Although when captured most Assassins do use the capsule, some the higher-ups in the organization aren't as quick to do so.