Complex sentence: Competing primarily in Bulgaria, Dimitrov has proven himself to be a rising prospect much like his brother Rosen Dimitrov.Currently he holds the champion belt in the bulgarian promotion MAX FIGHT in the Middleweight division.
Split into simpler sentences: Competing primarily in Bulgaria, Dimitrov has proven himself to be a rising prospect much like his brother Rosen Dimitrov. Rumen Dimitrov holds the champion belt in the bulgarian promotion MAX FIGHT in the Middleweight division.