Complex sentence: In 1995, Harbinger Sign began its relationship with 7-Eleven when the company invented and introduced an innovative and more cost-effective illumination system for signs utilizing LED technologies in place of the prevailing fluorescent illumination.
Split into simpler sentences: In 1995, Harbinger Sign began its relationship with 7-Eleven. Harbinger invented and introduced a more cost-effective illumination system for signs utilizing LED technologies in place of the prevailing fluorescent illumination.