Original sentence: When Koval was honored, the Russian presidential proclamation stated, "Mr Koval, who operated under the pseudonym Delmar, provided information that helped speed up considerably the time it took for the Soviet Union to develop an atomic bomb of its own ...."
Edited sentence: When Koval was honored, the Russian presidential proclamation stated, "Mr Koval, who operated under the pseudonym Delmar, provided information that helped speed up considerably the time it took for the Soviet Union to develop an atomic bomb of its own...."