Complex sentence: Weetabix Ltd., trading under the name Weetabix Food Company and commonly referred to as simply Weetabix, is a food processing company that is responsible for the production of breakfast cereal brands.
Split into simpler sentences: Weetabix Ltd., trading under the name Weetabix Food Company and commonly referred to as simply Weetabix, is the name Weetabix Ltd. trades under. The company is a food processing company that is responsible for the production of breakfast cereal brands.