Complex sentence: They jointly designed Temenos, "a gently twisted tube on a vast butterfly net" which appeared in June, located in the UK's Teesside, it is the first of five giant sculpture which will form in the biggest public art work in the world.
Split into simpler sentences: They jointly designed Temenos, "a gently twisted tube on a vast butterfly net" which appeared in June, located in the UK's Teesside. It is the first of five giant sculpture which will form in the biggest public art work in the world.