Complex sentence: It was 1813 when she at last permitted him to live with her, though the arrangement soon failed, and a year later, after a heated argument between mother and son, Arthur was asked to leave the house.
Split into simpler sentences: It was 1813 when she at last permitted him to live with her. The arrangement, however, soon failed: a year later, after a heated argument between mother and son, Arthur was asked to leave the house.