Complex sentence: Jackson was one of the more sickly presidents, suffering from chronic headaches, abdominal pains, and a hacking cough, caused by a musket ball in his lung that was never removed, that often brought up blood and sometimes made his whole body shake.
Split into simpler sentences: Jackson was one of the more sickly presidents, suffering from chronic headaches, abdominal pains, and a hacking cough. Much of his trouble was caused by a musket ball in his lung that was never removed, that often brought up blood and sometimes made his whole body shake.