i'm afraid i have no idea what the sentence is trying to say either cung an is a different person from wang gao wang gao appears to be the maternal great grandfather or maternal grandfather of nurhaci while cung an is apparently also said by some to be an ancestor of nurhaci but that is uncertain with no source i don't really know what the sentence is trying to say personally i would just delete wang gao as it appears to have no relation to that sentence i have some books on chinese history but right now i'm preoccupied with something else so i'll have to check it another time