Complex sentence: During the war, the Federal Railroad Administration took control of the Canal; when the war was over, the disappointed "Boston, Cape Cod and New York Canal Company", viewing the Canal as a bad investment, refused to take it back.
Split into simpler sentences: During the war, the Federal Railroad Administration took control of the Canal. When the war was over, the disappointed "Boston, Cape Cod and New York Canal Company", viewing the Canal as a bad investment, refused to take it back.