Complex sentence: Beginning in 2006, McDonalds began testing hamburgers made with Angus beef at a number of its restaurants in several regions in the US; the company said that customer response to the burgers was positive and began selling the burger at all US locations in July 2009.
Split into simpler sentences: Beginning in 2006, McDonalds began testing hamburgers made using Angus beef at a number of its restaurants in several regions in the US. After this test, the company said that customer response to the burgers was positive and began selling the burger at all US locations in July 2009.