Complex sentence: Napoleon hoped that by making Antwerp's harbour the finest in Europe he would be able to counter London's harbour and stint British growth, but he was defeated at the Battle of Waterloo before he could see the plan through.
Split into simpler sentences: Napoleon hoped that by making Antwerp's harbour the finest in Europe he would be able to counter the Port of London and dent British growth. However, he was defeated at the Battle of Waterloo before he could see the plan through.