Complex sentence: He farmed tobacco, taught at the Rockville Female Academy, gave public lectures, served as treasurer of the Old Bay Line steamship company on Chesapeake Bay, and became a teacher at the St. Joseph Catholic School in Emmitsburg, Maryland.
Split into simpler sentences: He farmed tobacco, taught at the Rockville Female Academy, gave public lectures, and became the treasurer of the Old Bay Line steamship company on Chesapeake Bay. He became a teacher at the St. Joseph Catholic School in Emmitsburg, Maryland.