Complex sentence: The Wesel Bridge was the first fixed bridge built by any Army Engineer to span the Rhine since the days of Caesar, according to military references, and was the first fixed bridge to span the Rhine River with highway bridges included.
Split into simpler sentences: The Wesel Bridge is the first fixed bridge built by any Army Engineer to span the Rhine since the days of Caesar according to military references. It was, however, the first fixed bridge to span the Rhine River constructed by Army Engineers with highway bridges included.