Complex sentence: A change of ownership occurred in 1952 when the Municipality of Milan took control of the airport's operator, the "Società Aeroporto di Busto Arsizio", and changed its name to "Società Esercizi Aeroportuali SpA" (SEA).
Split into simpler sentences: A change of ownership occurred in 1952 when the Municipality of Milan took control of the airport's operator, the "Società Aeroporto di Busto Arsizio". The operator's name was subsequently changed to "Società Esercizi Aeroportuali SpA" (SEA).