Complex sentence: He has been a guest artist with many different companies around the world, including the Mariinsky Ballet, the Paris Opera Ballet, Royal Swedish Ballet, Kiev Ballet in the Ukraine, Ballet Estable del Teatro Colón in Buenos Aires and many others.
Split into simpler sentences: He has been a guest artist and danced with many different companies around the world. The companies he has danced with include the Royal Swedish Ballet, Kiev Ballet in the Ukraine, Ballet Estable del Teatro Colón in Buenos Aires and many others.