Complex sentence: He had two sons, Jeffery and Brian, with his second wife Shirley and he suffered a strained relationship with them, no doubt in part because of his extended absences, drinking and erratic personal behavior.
Split into simpler sentences: He had two sons, Jeffery and Brian, with his second wife Shirley. Jones had a strained relationship with his sons, no doubt in part because of his extended absences, drinking and erratic personal behavior.