Complex sentence: Scott set up his own trekking agency in 1989, and pays the porters and other staff double the going rate, with improved working conditions, porters' loads being reduced and clothing purchased to combat the cold and rain.
Split into simpler sentences: Scott set up his own trekking agency in 1989, and pays the porters and other staff double the going rate, with improved working conditions. Porters' loads were reduced and clothing purchased to combat the cold and rain.