Complex sentence: In 1939, Hatley was fired from the Roach studio, although he returned, at Stan Laurel's insistence, to score one final Laurel & Hardy film, "Saps at Sea".
Split into simpler sentences: In 1939, Hatley was fired from the Roach studio. At the insistence of Stan Laurel, however, he did return to score one final Laurel & Hardy film, "Saps at Sea".