Complex sentence: He first became involved with the Mafia in 1945 and by the following year he was a full-fledged member of the Porta Nuova Family and his first boss was Giuseppe "Pippo" Calò.
Split into simpler sentences: He first became involved with the Mafia in 1945. By 1946 he was a full-fledged member of the Porta Nuova Family and his first boss was Giuseppe "Pippo" Calò.