Complex sentence: He was appointed Professor of Rhetoric at Carlow College in 1850 left briefly in 1853 returning in 1854 as Dean of the Ecclesiastical College and Professor of Moral Philosophy.in 1856 Professor of Natural Philosophy (lecturing in Chemistry and Chemical Physics) in 1857.
Split into simpler sentences: He was appointed Professor of Rhetoric at Carlow College in 1850 left briefly in 1853 returning in 1854 as Dean of the Ecclesiastical College and Professor of Moral Philosophy. In 1856 Professor of Natural Philosophy (lecturing in Chemistry and Chemical Physics) in 1857.