Complex sentence: Having to go barefoot is a traditional indicator usually of the lowest class within a social hierarchy, at this mostly imposed on slaves or people lacking basic civil rights and liberties (see religious aspects; imprisonment and slavery; exposure; public humiliation).
Split into simpler sentences: Having to go barefoot is a traditional indicator of the lowest class within a social hierarchy. Bare feet often earmark a person without basic rights as it was commonly imposed on slaves (see religious aspects; imprisonment and slavery; exposure; public humiliation).