Complex sentence: A running (non-interactive) demo was released in 1995, exhibiting many features that were far ahead of their time; for example, it had real-time shadows two years before the Quake engine, considered the most advanced engine when Quake came out in 1996.
Split into simpler sentences: A running (non-interactive) demo was released in 1995, exhibiting many features that were far ahead of their time. For example, it had real-time shadows two years before the Quake engine, considered the most advanced engine when Quake came out in 1996.