Complex sentence: He was Liverpool's first rugby league superstar, who saw a promising Association football career with Rotherham United ended by a knee injury before going on to become a St. Helens legend.
Split into simpler sentences: He was Liverpool's first rugby league superstar. Born in Liverpool, Ellaby He saw a promising Association football career with Rotherham United ended by a knee injury before going on to become a St. Helens legend.