Complex sentence: To replace him, Corallo put his protégé Anthony "Buddy" Luongo as "acting boss" sometime in early 1986, but toward December of that same year, Luongo disappeared.
Split into simpler sentences: To replace him, Corallo put his protégé Anthony "Buddy" Luongo as "acting boss" sometime in early 1986. However, around December of that same year, Luongo disappeared.