Complex sentence: The main street that runs through Luganville contains most of the commercial businesses and is very wide as a result of the American base commander insisting that four army tanks could be driven side by side along the road.
Split into simpler sentences: The main street that runs through Luganville contains most of the commercial businesses. It is unusually wide as a result of the American base commander insisting that four army tanks must be able to be driven side by side along the road.