Complex sentence: Verdeschi, who assumed the base's second in command role, neither appeared, nor was ever mentioned, in Year One; unlike Maya, however, Moonbase Alpha personnel treated Verdeschi as if he had been in their midst since "Breakaway".
Split into simpler sentences: Verdeschi, who assumed the base's second in command role, neither appeared, nor was ever mentioned, in Year One. However, Moonbase Alpha personnel treated Verdeschi as if he had been in their midst since "Breakaway".