Complex sentence: In 1919 he resumed his residency at New College, Oxford, where in 1921 he earned a BA degree second class in modern history, and in 1922, a B.Litt in theology for a thesis on John Wesley.
Split into simpler sentences: In 1919 he resumed his residency at New College, Oxford, where he earned a BA degree second class in modern history 1921. The next year, he earned a B.Litt in theology for a thesis on John Wesley.