Complex sentence: All of the names on the list had a Horus falcon, the symbol of a king, next to it, however, except for Merneith's name, which may have been unacceptable for a woman.
Split into simpler sentences: All of the names on the list had a Horus falcon, the symbol of a king, next to it. However, there is no falcon against Merneith's name, as using that symbol may have been unacceptable for a woman.