Complex sentence: From 1938 to 2002 it was open as John Brown's Cave tourist attraction, with a hollowed-out area beneath the new location being represented as a place where escaping slaves were hidden.
Split into simpler sentences: From 1938 to 2002 it was open as John Brown's Cave tourist attraction. A hollowed-out area beneath the new location was created and represented as a place where escaping slaves were hidden.