Complex sentence: While stationed in London, the government contributed Norwegian forces to the Allied effort and ordered the Norwegian Merchant Fleet to assist in transportation, to facilitate this the ships were operated under the Nortraship organization; at that time the world's largest shipping company.
Split into simpler sentences: While stationed in London, the government contributed Norwegian forces to the Allied effort and ordered the Norwegian Merchant Fleet to assist in transportation. To facilitate this the ships were operated under the Nortraship organization, at that time the world's largest shipping company.