Complex sentence: Despite the coroner's findings, Lt. Costello had become convinced that Elsie's death was an accident and that she had simply fallen into the canal, although Inspector Healey had had the canals and drainage ditches dragged repeatedly during the search.
Split into simpler sentences: Despite the coroner's findings, Lt. Costello had become convinced that Elsie's death was an accident and that she had simply fallen into the canal. However, Inspector Healey had had the canals and drainage ditches dragged repeatedly during the search.