Complex sentence: In September 2001, online casino GoldenPalace.com paid boxer Bernard Hopkins US $100,000 to wear a temporary tattoo on his back during his championship fight with Félix Trinidad, making him the first athlete to wear a tattoo advertisement during a professional sports event.
Split into simpler sentences: In September 2001, online casino GoldenPalace.com paid boxer Bernard Hopkins US $100,000 to wear a temporary tattoo on his back during his championship fight with Félix Trinidad. Hopkins was the first athlete to wear a tattoo advertisement during a professional sports event.