Complex sentence: Eclectic Medicine expanded during the 1840s as part of an immense populist anti-regular medical movement in North America, which used many principles of Samuel Thomson's family herbal medication but which chose to train doctors in physiology and more conventional principles along with botanical medicine.
Split into simpler sentences: Eclectic Medicine expanded during the 1840s as part of an large, populist anti-regular medical movement in North America. It used many principles of Samuel Thomson's family herbal medication but chose to train doctors in physiology and more conventional principles, along with botanical medicine.