Complex sentence: In modern-day Korea, the yangban, as a class system, no longer exists nor does having a yangban lineage possess any real social advantage or meaning although it is not uncommon to jokingly boast of having a "yangban" ancestor or connections.
Split into simpler sentences: In modern-day Korea, the yangban, as a class system, no longer exists. Nowadas, having a yangban lineage does not confer any real social advantage or meaning among modern Koreans, although it is not uncommon to jokingly boast of having a "yangban" ancestor or connections.