Complex sentence: Declassified records show Avro management was caught unprepared by the suddenness of the announcement by the government; while executives were aware that the program was in jeopardy, they expected it to continue until the March review.
Split into simpler sentences: Declassified records show Avro management was caught unprepared by the suddenness of the announcement by the government. While executives were aware that the program was in jeopardy, they expected it to continue at least until the March review.