Complex sentence: It was also used as the heraldic colour of the Kingdom of Castile in antiquity, although the colour is prone to alterations or fading with time and use, resulting in one of the varieties of crimson or maroon.
Split into simpler sentences: It was also used as the heraldic colour of the Kingdom of Castile in antiquity. This colour, however, is prone to alterations or fading with time and use, resulting in one of the varieties of crimson or maroon.