Complex sentence: It begins at the junction with several Canadian highways in Dawson Creek, British Columbia and runs to Delta Junction, Alaska, via Whitehorse, Yukon which is completely in 1942 at a length of approximately, and it was long.
Split into simpler sentences: It begins at the junction with several Canadian highways in Dawson Creek, British Columbia and runs to Delta Junction, Alaska, via Whitehorse, Yukon. Completed in 1942 at a length of approximately, it was long.