Complex sentence: The victims would be lured back to one of three addresses in which Haarmann is known to have resided throughout the years he is known to have killed upon the promise of assistance, accommodation, work, or under the pretense of arrest.
Split into simpler sentences: The victims would be lured back to one of three addresses in which Haarmann is known to have resided. Throughout the years he is known to have killed upon the promise of assistance, accommodation, work, or under the pretense of arrest.