Complex sentence: They have toured in the USA, Canada, Belgium, Italy and France and were invited to perform alongside Bryn Terfel and Sting at the Royal Albert Hall, London as part of Bryn Terfel's 50th birthday party.
Split into simpler sentences: They have toured in the USA, Canada, Belgium, Italy, and France. They were invited to perform alongside Bryn Terfel and Sting at the Royal Albert Hall, London as part of Bryn Terfel's 50th birthday party.