Complex sentence: Pumpkins have been used by Native Americans to treat intestinal worms and urinary ailments; this Native American remedy was adopted by American doctors in the early nineteenth century as an anthelmintic for the expulsion of worms.
Split into simpler sentences: Pumpkins have been used by Native Americans to treat intestinal worms and urinary ailments. This Native American remedy was adopted by American doctors in the early nineteenth century as an anthelmintic for the expulsion of worms.