Complex sentence: He has been married for 20 years to Tina (unseen) with whom he shares an intense love-hate relationship, as he often complains about their marriage, but he occasionally reveals that he does indeed love his wife.
Split into simpler sentences: He has been married for 20 years to Tina (unseen) with whom he shares an intense love-hate relationship, as he often complains about their marriage. But he occasionally reveals that he does indeed love his wife.