Complex sentence: Eilers' winning streak came to an end when, on the 9th of March, 2007, he lost to Pedro Rizzo by unanimous decision at the début show of the Undisputed Arena Fighting Championships, which was held in Dallas, Texas.
Split into simpler sentences: Eilers' winning streak came to an end when, on the 9th of March, 2007, he lost to Pedro Rizzo by unanimous decision. The fight took place at the début show of the Undisputed Arena Fighting Championships, and was held in Dallas, Texas.