Complex sentence: Bob has been married six times to four women, he was first married to Jean Hope, whom he has married twice, the mother of his eldest children Dawn and Jamie, but the marriage ended in divorce when he walked out.
Split into simpler sentences: Bob has been married six times to four women, he was first married to Jean, whom he married twice. She is the mother of his eldest children Dawn and Jamie, but the marriage ended in divorce when he walked out.