Complex sentence: The roots and rhizomes of the plant have long been used medicinally by Native Americans because of its analgesic, sedative, and anti-inflammatory effects; today, black cohosh preparations (tinctures or tablets of dried materials) are used chiefly to treat symptoms associated with menopause.
Split into simpler sentences: The roots and rhizomes of black cohosh have long been used medicinally by Native Americans. Today, black cohosh preparations (tinctures or tablets of dried materials) are used chiefly to treat symptoms associated with menopause.