Complex sentence: On April 14,2009, Microsoft officially merged Cashback with the then Live Search Products, and later renamed it to Bing Cashback on June 3,2009 as part of the its rebranding ofm Li Search to Bing, the service was renamed "Bing Cashback".
Split into simpler sentences: On April 14,2009, Microsoft officially merged Cashback with the then Live Search Products. On June 3,2009, as part of the rebrand from Live Search to Bing, the service was renamed "Bing Cashback".