Complex sentence: Although the British economy and commercial interests benefited from the war, the British government was opposed to it from the start, the general view being that all war damaged international commerce, and it was discontented with the secret clauses in the Treaty of the Triple Alliance.
Split into simpler sentences: Although the British economy and commercial interests benefited from the war, the UK government opposed it from the start. It believed that war damaged international commerce, and disapproved of the secret clauses in the Treaty of the Triple Alliance.