Complex sentence: On 1 May 2009, Arsenal announced that Kroenke had bought a further 4,839 shares from the Carr family, including Richard Carr, also a director, which made him the largest shareholder of the company with 28.3%.
Split into simpler sentences: On 1 May 2009, Arsenal announced that Kroenke had bought a further 4,839 shares from the Carr family, including Richard Carr, a current member of the board. This purchase made him the largest shareholder of the company with 28.3%.