Complex sentence: Leslie Gesneria was a mercenary who worked for a sinister corporation called the "Life Foundation", who was preparing for the M.A.D. nuclear fallout of the Cold War and sought to provide a comfortable underground life for their wealthy clients after the impending nuclear holocaust.
Split into simpler sentences: Leslie Gesneria was a mercenary who worked for a sinister corporation called the Life Foundation. The Foundation was preparing for the M.A.D. fallout of the Cold War and sought to provide a comfortable life for their wealthy clients after the impending nuclear holocaust.