Complex sentence: Located as an'unidentified wreck' during WWII, it was rediscovered in 1958 and positively identified by a serial number on a Chubb strongbox in 1961.
Split into simpler sentences: Located as an'unidentified wreck' during WWII. Rediscovered in 1958 and positivly identified by a serial number on a Chubb strongbox in 1961.