Complex sentence: Developed in Russia by Eagle Dynamics and published by SSI, "Su-27 Flanker" contained a very realistic and detailed flight model requiring only a sub-par graphics shell, allowing the game to run on relatively minimal computer system requirements at the time.
Split into simpler sentences: Developed in Russia by Eagle Dynamics & published by SSI, "Su-27 Flanker" contained a very realistic and detailed flight model in a subpar graphics shell. However, this allowed the game to run on relatively minimal computer system requirements at the time.