Complex sentence: Although violent, dogfighting provides an opportunity for Octavio to make money, this is true to life in the sense that participating in the underground economy gives people in the lower class the ability to make money and experience mobility.
Split into simpler sentences: Although violent, dogfighting provides an opportunity for Octavio to make money. This is true to life in the sense that participating in the underground economy gives people in the lower class the ability to make money and experience mobility.