Complex sentence: He was appointed commissioner to revise the United States marine hospital system in 1849; moved to Salem, Massachusetts in 1851; appointed postmaster of Salem on May 4 1853, and served until his successor was appointed on February 16 1858.
Split into simpler sentences: He was appointed commissioner to revise the United States marine hospital system in 1849. Moved to Salem, Massachusetts in 1851; appointed postmaster of Salem on May 4 1853, and served until his successor was appointed on February 16 1858.