Complex sentence: In June 2013, it was reported that Walker was to receive chemotherapy in the coming months and had cancelled plans to attend the 2013 British Grand Prix at Silverstone, however on 28 July 2013, Walker revealed that he no longer requires chemotherapy.
Split into simpler sentences: In June 2013, it was reported that Walker was to receive chemotherapy in the coming months and had cancelled plans to attend the 2013 British Grand Prix at Silverstone. However, on 28 July 2013, Walker revealed that he no longer requires chemotherapy.