Complex sentence: His fix was a physics engine, bounded by football rules, and the result was the formation of Bethesda Softworks and the release of "Gridiron!" for the Atari ST and Commodore 64/128, released in 1986.
Split into simpler sentences: His fix was a physics engine, bounded by football rules. The game was released as "Gridiron!" for the Atari ST and Commodore 64/128, in 1986.