Complex sentence: The first major console title to be developed with Luminous Studio was "Final Fantasy XV"; the engine's development was done in tandem with the game, and the game's development helped the programming team optimize the engine.
Split into simpler sentences: The first major console title to be developed with the Luminous Studio was "Final Fantasy XV". Luminous's development was done in tandem with "XV", and the game's development helped the programming team optimize the engine.