Complex sentence: Manix undertook various missions, all designed to subtly entrench Cameron's position; he realised that his long-term survival was jeopardised by Cameron's actions, but was unable to disobey them.
Split into simpler sentences: Manix undertook various missions, all designed to subtly entrench Cameron's position. Manix realised that his long-term survival was jeopardised by Cameron's actions, but found himself unable to disobey them.