Complex sentence: A more recent local landmark is Castle Gwynn, a replica of a 12th-century Welsh border castle built beginning in 1980 as a private residence and used as the location of the Tennessee Renaissance Festival, a Renaissance fair held annually in May.
Split into simpler sentences: A more recent local landmark is Castle Gwynn, a replica of a 12th-century Welsh border castle. It was built as private residence beginning in 1980 and serves as the location of the Tennessee Renaissance Festival, a Renaissance fair held annually in May.