Complex sentence: Little is known about what became of Lt. Rodríguez, except that as a civilian he became a firefighter in New Haven, plus the records show that he was also a proprietor of a cigar store, a bartender and saloon keeper.
Split into simpler sentences: Little is known about what became of Lt. Rodríguez, except that as a civilian he became a firefighter in New Haven. Records show that he also became a proprietor of a cigar store, a bartender and saloon keeper.