Complex sentence: Connett writes that a hacksaw blade that might have been used to gain entry to the house lay in the garden for months, and officers did not take contemporaneous notes: those who dealt with Bamber wrote down their statements weeks later.
Split into simpler sentences: Connett writes that a hacksaw blade that might have been used to gain entry to the house lay in the garden for months. Officers did not take contemporaneous notes: those who had dealt with Bamber wrote down their statements weeks later.