Complex sentence: He graduated from Yale University in 1842, having entered the Junior class in 1840; studied in the Theological Department of Yale, and in 1844--1845 was a tutor in Middlebury College.
Split into simpler sentences: He graduated from Yale University in 1842, having entered the junior class in 1840, and then studied theology at Yale. In 1844--1845 was a tutor in Middlebury College.