Complex sentence: Mamoru Oshii is an enthusiast gamer playing cult games such as "Wizardry" or "Virtua Fighter", in 2001, he has imagined a living by the game concept in the live-action film "Avalon".
Split into simpler sentences: Mamoru Oshii is an enthusiast gamer playing games such as "Wizardry" and "Virtua Fighter". In 2001 he envisioned a "living by the game concept" in the live-action film "Avalon".