Complex sentence: It is not to be confused with the Roman Catholic which is an association of Opus Dei nor with the Society of the Holy Cross (Korea) (SHC), an order of nuns within the Anglican Church of Korea.
Split into simpler sentences: It is not to be confused with the Roman Catholic which is an association of Opus Dei. It should neither be confused with the Society of the Holy Cross (Korea) (SHC), an order of nuns within the Anglican Church of Korea.