Complex sentence: See Connell, 204 Hughes, 372 Adrift from his former public office and probably embittered by recent developments in Spanish politics, he had withdrawn from public life, so little record of his thoughts from this period survive.
Split into simpler sentences: See Connell, 204 Hughes, 372 He was adrift from his former public office, and probably embittered by recent developments in Spanish politics. He had withdrawn from public life, so little record of his thoughts from this period survive.