Original sentence: The divers also recovered the Cross of Nails originally presented to the ship by Coventry Cathedral and this was presented back to the Bishop of Coventry in March 1983.This survey was a prerequisite to a dive on the wreck to recover classified documentation and make the remaining weapons safe
Edited sentence: The divers also recovered the Cross of Nails originally presented to the ship by Coventry Cathedral, and this was presented back to the Bishop of Coventry in March 1983.This survey was a prerequisite to a dive on the wreck, named "Operation Blackleg", to recover classified documentation and make the remaining weapons safe