Complex sentence: During the early 20th century, old farms in Cornwall were sold to New Yorkers seeking a better life in the countryside, including Dudleytown, which has been privately owned since 1924 by Dark Entry Forest, Incorporated.
Split into simpler sentences: During the early 20th century, old farms in Cornwall were sold to New Yorkers seeking a better life in the countryside. The land upon which Dudleytown used to exist has been privately owned since 1924 by Dark Entry Forest, Incorporated.