Complex sentence: As a result, the evaporative cooling system had to be abandoned in favor of conventional annular radiators fitted directly behind each propeller, which resembled but were larger than those fitted to the Junkers Ju 88 A bomber.
Split into simpler sentences: As a result, the evaporative cooling system had to be abandoned in favor of conventional annular radiators fitted directly behind each propeller. These resembled, but were larger than, those fitted to the Junkers Ju 88 A bomber.