Complex sentence: Thredbo is host to the world-renowned downhill track, the Cannonball Run, which is accessed by taking the Kosciusko Express Quad-Chairlift up to Eagles Nest.
Split into simpler sentences: Thredbo is host to the world-renowned downhill track, the Cannonball Run. The Cannonball Run is accessed by taking the Kosciusko Express Quad-Chairlift up to Eagles Nest.