Complex sentence: That autumn, Keats left Clarke's school to apprentice with Thomas Hammond, a surgeon and apothecary, neighbour and doctor of the Jennings family, and lodged in the attic above the surgery at 7 Church Street until 1813.
Split into simpler sentences: That autumn, Keats left Clarke's school to apprentice with Thomas Hammond, a surgeon and apothecary who was a neighbour and the doctor of the Jennings family. Keats lodged in the attic above the surgery at 7 Church Street until 1813.