Complex sentence: Kier claimed that SEGA offered to pay her $16,000 to license her name, image and songs for the game, ultimately rejecting its offer, and later learning that SEGA went ahead and used her likeness anyway without her permission, afterwhich she initiated the lawsuit.
Split into simpler sentences: Kier claimed that SEGA offered to pay her $16,000 to license her name, image and songs for the game, though she ultimately rejected its offer. Kier later learned that SEGA went ahead and used her resemblance without her permission, and she decided to initiate the lawsuit.