Complex sentence: He married Susan Skinner in 1965 and had one son, Patrick (born 1970); however by 1973 the marriage began to break down due to Lynam's career and other commitments, and they divorced in 1974.
Split into simpler sentences: He married Susan Skinner in 1965 and had one son, Patrick who was born in 1970. However, by 1973 the marriage began to break down due to Lynam's career and other commitments, and they divorced in 1974.