Complex sentence: Under the circumstances, Creighton lived economically in college attic rooms during most of his time at Merton; in his last year he moved out of college to share rooms with George Saintsbury, the future author and wine critic.
Split into simpler sentences: Under the circumstances, Creighton lived economically in college attic rooms for most of his time at Merton. In his last year he moved out of college to share rooms with George Saintsbury, the future author and wine critic.