Complex sentence: The High Hills of Santee, sometimes known as the High Hills of the Santee, is a long, narrow hilly area in the western part of Sumter County, South Carolina, which has been called "one of the state's most famous areas".
Split into simpler sentences: The High Hills of Santee, sometimes known as the High Hills of the Santee, is a long, narrow hilly area in the western part of Sumter County, South Carolina. It has been called "one of the state's most famous areas".