Complex sentence: His command consisted of comprised elements ("vexillationes ") of"Legio V Macedonica " and"Legio XIII Gemina "-there is no known instance of a"praepositus" commanding a full legion.
Split into simpler sentences: His command consisted of comprised detachments ("vexillationes ") of"Legio V Macedonica " and"Legio XIII Gemina ". There is no known instance of a"praepositus" commanding a full legion.