Complex sentence: The reagent coomassie brilliant blue it turns blue when it binds to arginine and aromatic amino acids present in protein, the intensity of the colour is measured at 595 nm with a spectrophotometer.
Split into simpler sentences: The reagent coomassie brilliant blue turns blue when it binds to arginine and aromatic amino acids present in protein. The intensity of the colour is best measured at 595 nm with a spectrophotometer.