Complex sentence: Trailwalker (or Oxfam Trailwalker) is an event organised by Oxfam in various locations across the globe, including Hong Kong, Australia, New Zealand and the United Kingdom, with proceeds in Hong Kong and the UK being split between Oxfam and the Gurkha Welfare Trust.
Split into simpler sentences: Trailwalker (or Oxfam Trailwalker) is an event organised by Oxfam in various locations across the globe, including Hong Kong, Australia, New Zealand and the United Kingdom. Proceeds from the Hong Kong and the UK events are split between Oxfam and the Gurkha Welfare Trust.