Complex sentence: One of the Inverse Quicksand killers, known as Han Kingdom's number one assassin, whose gender is unknown in animated TV series, while is female (but lived in Spring and Autumn period) in official webgame, but is male in the drama.
Split into simpler sentences: One of the Inverse Quicksand killers, who is also known as the Han Kingdom's number one assassin. His/Her gender is unknown in the animated TV series, but is a female (but lived in Spring and Autumn period) in the official webgame, and is a male in the drama.