Original sentence: There was some later speculation that, had the Soviets been open about the circumstances of Bondarenko's death, NASA might have been alerted to the hazardous design of the early Apollo command module and would have made changes which could have prevented the 1967 deaths of the three Apollo 1 crew members
Edited sentence: There was some later speculation that, had the Soviets been open about the Bondarenko tragedy, NASA might have been alerted to the hazardous design of the early Apollo command module and would have made changes which could have prevented the 1967 deaths of the three Apollo 1 crew members