Complex sentence: Elected to the title of Collegiate in 1755, was named for the Roman basilica minor on June 22 of 1962 a few years later he switched to the Diocese of Chiavari (1959).
Split into simpler sentences: Elected to the title of Collegiate Church in 1755, it was named a minor basilica on June 22 of 1962. A few years later he switched to the Diocese of Chiavari (1959).