Complex sentence: The switch to synthetic surfaces ended Indian and Pakistani domination because artificial turf was too expensive--in comparison to the wealthier European countries--and since the 1970s Australia, the Netherlands and Germany have dominated at the Olympics.
Split into simpler sentences: The switch to synthetic surfaces ended Indian and Pakistani domination because artificial turf was too expensive in developing countries. Since the 1970s, Australia, the Netherlands, and Germany have dominated at the Olympics.