Complex sentence: Corporal Tank Dempsey, Sergeant Nikolai Belinski and Captain Takeo Masaki, as well as to kill a specific version of Richtofen himself, across various timelines, and acquire the souls of the other three with the Key once found.
Split into simpler sentences: Corporal Tank Dempsey, Sergeant Nikolai Belinski, and Captain Takeo Masaki. Richtofen also must kill a specific version of himself, and acquire the souls of all four with the Key once found.