Complex sentence: The character is an android, first introduced under the name "Jack" in the original "Tekken", and subsequent Tekken games feature an upgraded model with a slightly different name, with the exception of "Tekken 4" in which he makes no appearance.
Split into simpler sentences: The character is an android, first introduced under the name "Jack" in the original video game "Tekken". Subsequent "Tekken" games feature an upgraded model with a slightly different name, with the exception of "Tekken 4", in which he makes no appearance.