Complex sentence: This work led to a study of sea ice in the Northeast Passage, and its impact on Soviet shipping, this for the Royal Navy Scientific Survey, after sailing with the Canadian icebreaker HMCS "Labrador" on its 1954 maiden voyage through the Northwest Passage.
Split into simpler sentences: This work led to a study of sea ice in the Northeast Passage, and its impact on Soviet shipping. For the Royal Navy Scientific Survey he sailed with the Canadian icebreaker HMCS "Labrador" on its 1954 maiden voyage through the Northwest Passage.