Original sentence: She returned to the Tyne shipyard of her birth, where her boilers were converted to oil-firing, and returned to service in March 1922; however, it was also noticed by Cunard that Mauretania was still struggling to maintain her service speeds and it was apparent that her once-revolutionary turbines were in desperate need of overhaul
Edited sentence: She returned to the Tyne shipyard of her birth, where her boilers were converted to oil-firing, and returned to service in March 1922; however, it was also noticed by Cunard that Mauretania was still struggling to maintain her service speeds and it was apparent that her revolutionary turbines were in desperate need of overhaul