Complex sentence: At the end of the film the wooden bridge is destroyed by a commando raid when actually, both bridges were used for two years until they were destroyed by Allied aerial bombing, the steel bridge first in June 1945; there had been seven previous bombing missions.
Split into simpler sentences: At the end of the film the wooden bridge is destroyed by a commando raid. Actually, both bridges were used for two years until they were destroyed by Allied aerial bombing, the steel bridge first in June 1945; there had been seven previous bombing missions.