Complex sentence: Later in the pub, David said that he hadn't regretted what happened with Nicola who said that they should wait until Donald died, then they would go public as a couple and claim Donald's money to have the perfect life.
Split into simpler sentences: Later in the pub, David said that he hadn't regretted what happened. Nicola insisted they wait until Donald died before going public as a couple, using Donald's money to have the perfect life.