Complex sentence: She was decommissioned in 1953 and reconstructed as a guided missile cruiser from 1957 in the La Spezia Arsenal and, at her completion in 1961, she was named flagship of the new Italian Navy.
Split into simpler sentences: She was decommissioned in 1953 and reconstructed as a guided missile cruiser. The new ship was rebuilt in the La Spezia Arsenal starting from 1957, and, at her completion in 1961, she was named flagship of the Italian Navy.