Complex sentence: Lockwood was found dead on 8 April 1964 on the foreshore of the Thames at Corney Reach, Chiswick, not far from where Tailford had been found; having discovered a third body, police realized that a serial murderer was at large.
Split into simpler sentences: Lockwood was found dead on 8 April 1964 on the foreshore of the Thames at Corney Reach, Chiswick, not far from where Tailford had been found. With the discovery of this third victim, police realized that a serial murderer was at large.