Complex sentence: Rio Tinto exclusively provides the metal to produce the 4,700 gold, silver, and bronze medals at the London 2012 Olympic and Paralympic Games.This is the second time Rio Tinto did so for Olympic medals, having previously done so for the Salt Lake City 2002 Winter Olympics.
Split into simpler sentences: Rio Tinto exclusively provided the metal to produce the 4,700 gold, silver, and bronze medals at the London 2012 Olympic and Paralympic Games. This was the second time Rio Tinto did so for Olympic medals, having previously done so for the Salt Lake City 2002 Winter Olympics.