Complex sentence: At the onset of the war, the British had around 8,000 men stationed in North America, however these were required to cover an area that stretched from northern Canada to Florida, a distance of almost 2,000 miles (3,200 km).
Split into simpler sentences: At the onset of the war, the British had around 8,000 men stationed in North America. However, these were required to cover an area that stretched from northern Canada to Florida, a distance of almost 2,000 miles (3,200 km).