Complex sentence: They are linked by several recurring characters, chiefly Rupert Campbell-Black, and are set in the fictional English county of Rutshire, not be confused with the real English county of Rutland.
Split into simpler sentences: They are linked by several recurring characters, chiefly Rupert Campbell-Black, and are set in the fictional English county of Rutshire. Rutshire should not be confused with the real English county of Rutland.