Complex sentence: It was their daughter's asthma that brought the Pollocks to Cornwall.They also lived in Ireland, France, Italy, Malta and Switzerland, where they successfully obtained a lasting cure for Rosemary's debilitating condition.
Split into simpler sentences: It was their daughter's asthma that brought the Pollocks to Cornwall. She also lived in Ireland, France, Italy, Malta and Switzerland, where they successfully obtained a lasting cure for Rosemary's debilitating condition.