Complex sentence: He tried but was proved right and after another argument caused by Jimmy telling Nicola she was curvaceous, which she interpreted as fat, he ended it and Lexi insisted that she move out of Mill Cottage, persuading Laurel to let Nicola move back into the vicarage.
Split into simpler sentences: He tried but was proved right and after another argument caused by Jimmy telling Nicola she was curvaceous, which she interpreted as fat, he dumped Nicola. She had intended to stay at Mill Cottage but Lexi insisted she move out and got Laurel to let Nicola move back into the vicarage.