Complex sentence: During the Crimean War in 1854 Crombie's business thrived as Great Britain focused it's efforts on manufacturing war materials which meant that Canada had to rely more on its own companies to manufacture goods.
Split into simpler sentences: During the Crimean War in 1854 Crombie's business thrived as Great Britain focused it's efforts on manufacturing war materials. This meant that Canada had to rely more on its own companies to manufacture goods.