Complex sentence: When his eldest son, George, was forced, at the age of nine, to wear a Ballila uniform in school, the family left Italy and moved to Château-d'Œx, Switzerland, where they remained for two years.
Split into simpler sentences: When his eldest son, George, was forced, at the age of nine, to wear a Ballila uniform in school, the family decided to leave Italy. The family moved to Château-d'Œx, Switzerland, where they remained for two years.