Complex sentence: He was a professor of chemistry at the Kentucky Military Institute in 1889 and 1890, and worked as a chemist for the Sugar Land Refinery, Texas, in 1890 and 1891.
Split into simpler sentences: He was a professor of chemistry at Kentucky Military Institute in 1889 and 1890. He worked as a chemist for the Sugar Land Refinery, Texas, in 1890 and 1891.