Complex sentence: Capt. Simmers's advice to BuShips that "it would not be practicable to complete the conversion until about 28 February" fell on deaf ears: the CNO insisted to BuShips that "Lafayette" would be commissioned as scheduled.
Split into simpler sentences: Capt. Simmers's advising BuShips that "it would not be practicable to complete the conversion until about 28 February" fell on deaf ears. The CNO insisted to BuShips that "Lafayette" would be commissioned as scheduled.