Complex sentence: In 1761 Lord Powis relinquished his position as Lord-Lieutenant of Shropshire and was appointed Lord-Lieutenant of Montgomeryshire instead, but he was reinstated to the Lord-Lieutenancy of Shropshire in 1764 and held both posts until his death eight years later.
Split into simpler sentences: In 1761 Lord Powis relinquished his position as Lord-Lieutenant of Shropshire and was appointed Lord-Lieutenant of Montgomeryshire instead, but he was reinstated to the Lord-Lieutenancy of Shropshire in 1764 and held both posts until his death. He once again became Lord-Lieutenant of Shropshire in 1764, and remained in this post until his death eight years later.