Complex sentence: In Chapter 92, after being shot by a 88 mm artillery cannon by Seras, it is revealed that the Major is a cyborg, accounting for how he survived being shot by a Russian execution squad.
Split into simpler sentences: In Chapter 92, after being shot with an 88 mm artillery cannon by Seras, it is revealed that the Major is in fact a cyborg. This accounts for how he survived being shot by a Russian execution squad.