Complex sentence: William Spalding (22 May 1809--16 November 1859) was a Scottish writer and academic who, for the last twenty years of his life served as professor of rhetoric and logic, in addition to authoring essays, reviews and historical texts.
Split into simpler sentences: William Spalding (22 May 1809--16 November 1859) was a Scottish writer and academic. For the last twenty years of his life he served as professor of rhetoric and logic, in addition to authoring essays, reviews and historical texts.