Complex sentence: Lexmark touted the Prebate Program as a benefit to the environment and to their customers, since it would allow customers to get cheaper cartridges, and the benefit to Lexmark was that it could keep empty cartridges out of the hands of competing rechargers.
Split into simpler sentences: Lexmark touted the Prebate Program as a benefit to the environment and to their customers, since it would allow customers to get cheaper cartridges. For Lexmark, the benefit of the Prebate Program was that they could keep empty cartridges out of the hands of competing rechargers.