Complex sentence: After earlier failed attempts, George Mallory took 22 hours and 45 minutes to complete ten repeats of Mount Donna Buang in Victoria Australia on November 1,1994 and in so doing, climbed in excess of 10,000 vertical meters.
Split into simpler sentences: After earlier failed attempts, George Mallory climbed and descended Mount Donna Buang in Victoria Australia ten times on November 1,1994. The ride was completed in 22 hours 45 minutes and in so doing, climbed in excess of 10,000 vertical meters.