Complex sentence: Some studies have shown that this is true as the crust has more dietary fiber and antioxidants such as pronyl-lysine, which is being researched for its potential colorectal cancer inhibitory properties.
Split into simpler sentences: Some studies have shown that this is true as the crust has more dietary fiber and antioxidants, notably pronyl-lysine. The pronyl-lysine found in bread crust is being researched for its potential colorectal cancer inhibitory properties.