Complex sentence: The training mission was in fact a set-up to get rid of Mueller and Kendall, and fake West's death (in order for him to join Section 8), and Hardy went to the base to confirm Styles' and Vilmer's involvement.
Split into simpler sentences: The training mission was a set-up to get rid of Mueller and Kendall, and fake West's death. West joined Section 8, and Hardy went to the base to confirm Styles' and Vilmer's involvement.