Complex sentence: The Saddle Seat World Cup is an international competition held every other year, is the highest level of competition for saddle seat equitation riders and is competed in by the National Saddle Seat Equitation Teams from many countries around the world.
Split into simpler sentences: The Saddle Seat World Cup is an international competition held every other year. It is the highest level of competition for saddle seat equitation riders and is competed in by the National Saddle Seat Equitation Teams from many countries around the world.