Complex sentence: The oldest, Les Dervallières, was developed in 1956 and was followed by Bellevue in 1959 and Le Breil and Malakoff in 1971.
Split into simpler sentences: The oldest, Les Dervallières, was developed in 1956. It was followed by Bellevue in 1959, and Le Breil and Malakoff in 1971.