Complex sentence: Electronic Arts was working on the first "John Madden Football" at the time, and hired Bethesda to help finish developing it, as well as acquiring distribution rights for future versions of "Gridiron!".
Split into simpler sentences: Electronic Arts was working on the first "John Madden Football" at the time, and hired Bethesda to help finish developing it. At the same time, they acquired distribution rights for future versions of "Gridiron!".