Complex sentence: Individuals on Gethen are "ambisexual", with no fixed gender identity, a fact which has a strong influence on the culture of the planet, and creates a large barrier for Ai, a male raised on Earth.
Split into simpler sentences: Individuals on Gethen are "ambisexual", with no fixed gender identity. This fact has a strong influence on the culture of the planet, and creates a large barrier for Ai, a male raised on Earth.