Complex sentence: The stadium was originally built by Laing Construction at a cost of £112 million and was designed and engineered by ArupSport, whose design incorporated a highly complex yet elegant cable-stayed roof structure which is suspended by twelve exterior masts and attached cables.
Split into simpler sentences: The stadium was built by Laing Construction at a cost of £112 million and was designed and engineered by ArupSport. The design incorporated a highly complex yet elegant cable-stayed roof structure which is suspended by twelve exterior masts and attached cables.