Complex sentence: Adams resumed farming at his home Peacefield in the town of Quincy; he also began to work on an autobiography (which he never finished) and resumed correspondence with such old friends as Benjamin Waterhouse and Benjamin Rush.
Split into simpler sentences: Adams resumed farming at his home Peacefield in the town of Quincy. He began to work on an autobiography (which he never finished), and resumed correspondence with such old friends as Benjamin Waterhouse and Benjamin Rush.