Complex sentence: They marry the following year but over the next two years, Mandy is frequently absent looking after her father, Caleb and misses Paddy but begins an affair with her father's carer and their marriage breaks down.
Split into simpler sentences: They marry the following year but over the next two years, Mandy is frequently absent looking after her father, Caleb. She misses Paddy but begins an affair with her father's carer and their marriage breaks down.