Complex sentence: The hydroxyanthracene glycosides act as a stimulant laxative by exciting peristalsis in the colon, by inhibiting absorption of water and electrolytes in the large intestine, which increases the volume of the bowel's contents, leading to increased pressure.
Split into simpler sentences: The hydroxyanthracene glycosides act as a stimulant laxative by exciting peristalsis in the colon. They trigger peristalsis by inhibiting the absorption of water and electrolytes in the large intestine, which increases the volume of the bowel's contents, leading to increased pressure.