sentences:  Starting in 960, in addition to being nominally submissive to Southern Tang, Qingyuan Circuit was also nominally submissive to Song, which had itself become Southern Tang's nominal overlord.After Liu's death, the circuit was briefly ruled by his biological nephew/adoptive son Liu Shaozi, who was then overthrown by the officers Zhang Hansi and Chen Hongjin.Zhang then ruled the circuit briefly, before Chen deposed him and took over.