Complex sentence: After the Metal Gear's completion is told the truth and imprisoned After Snake rescued him from Gray Fox, Otacon offered him support via Codec, as he wished to destroy what he created, as he supporter of anti-nuclear proliferation.
Split into simpler sentences: After the Metal Gear's completion he is told the truth and imprisoned. Following being rescued by Snake from Gray Fox, Otacon offers him support via Codec, as he wished to destroy what he created, as he supporter of anti-nuclear proliferation.