《宋史·列传·卷四十二》
先例，曾为宰相而授官枢密使，才得升任仆射，真宗于是以丁谓任检校太尉兼本官为枢密使。
故事，尝为宰相而除枢密使，始得迁仆射，乃以谓检校太尉兼本官为枢密使。
According to the precedent, only those who had been prime ministers and were appointed to the position of privy envoy could be promoted to Zuo Shu. Zhenzong thus appointed Ding Wei, who was the Inspector general governor and concurrently held his original post as the privy envoy.
<s>[INST] Kindly elucidate the central themes in this passage in English: 故事，尝为宰相而除枢密使，始得迁仆射，乃以谓检校太尉兼本官为枢密使。 [/INST] According to the precedent, only those who had been prime ministers and were appointed to the position of privy envoy could be promoted to Zuo Shu. Zhenzong thus appointed Ding Wei, who was the Inspector general governor and concurrently held his original post as the privy envoy.</s>
Kindly elucidate the central themes in this passage in English: 故事，尝为宰相而除枢密使，始得迁仆射，乃以谓检校太尉兼本官为枢密使。
user
According to the precedent, only those who had been prime ministers and were appointed to the position of privy envoy could be promoted to Zuo Shu. Zhenzong thus appointed Ding Wei, who was the Inspector general governor and concurrently held his original post as the privy envoy.
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