Complex sentence: Some intestinal helminth worms, such as the Ascaris feed on blood extracted from the capillaries of the gut and about 75% of all species of leeches, a free-living worm, are hematophagous.
Split into simpler sentences: Some intestinal helminth worms, such as the Ascaris also feed on blood extracted from the gut's capillaries. About 75% of all species of leeches, a free-living worm, are hematophagous.