Complex sentence: The saltire or blue'X' behind the Fleur-de-lis can be interpreted as symbolizing the symbol used on military maps to represent a brigade or the south's penchant for confederated rather than centralized government.
Split into simpler sentences: The saltire or blue'X' behind the Fleur-de-lis can be interpreted as representing the symbol used on military maps for a brigade. Or, it could represent the south's penchant for confederated rather than centralized government.