Complex sentence: Sanders advocates lowering the cost of drugs that are high because they remain under patent for years; some drugs that cost thousands of dollars per year in the U.S. are available for hundreds, or less, in countries where they can be obtained as generics.
Split into simpler sentences: Sanders advocates lowering the cost of drugs that are high because they remain under patent for years. Some drugs that cost thousands of dollars per year in the U.S. are available for hundreds, or less, in countries where they can be obtained as generics.